Vulnerable Library - rack-test-2.2.0.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Vulnerabilities
| Vulnerability |
Severity |
 CVSS |
Exploit Maturity |
EPSS |
Dependency |
Type |
Fixed in (rack-test version) |
Remediation Possible** |
| CVE-2026-34829 |
 High |
7.5 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34827 |
High |
7.5 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34785 |
High |
7.5 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-22860 |
High |
7.5 |
Not Defined |
0.1% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2025-61919 |
High |
7.5 |
Not Defined |
0.2% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2025-61772 |
High |
7.5 |
Not Defined |
0.2% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2025-61771 |
High |
7.5 |
Not Defined |
0.1% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2025-61770 |
High |
7.5 |
Not Defined |
0.2% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34830 |
 Medium |
5.9 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2025-61780 |
Medium |
5.8 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-25500 |
Medium |
5.4 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34826 |
Medium |
5.3 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34786 |
Medium |
5.3 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34763 |
Medium |
5.3 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34230 |
Medium |
5.3 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34835 |
Medium |
4.8 |
Not Defined |
0.1% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-34831 |
Medium |
4.8 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-32762 |
Medium |
4.8 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-26962 |
Medium |
4.8 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
| CVE-2026-26961 |
 Low |
3.7 |
Not Defined |
0.0% |
rack-3.2.1.gem |
Transitive |
N/A* |
❌ |
*For some transitive vulnerabilities, there is no version of direct dependency with a fix. Check the "Details" section below to see if there is a version of transitive dependency where vulnerability is fixed.
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
CVE-2026-34829
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENT_LENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfer encoding, multipart parsing continues until end-of-stream with no total size limit. For file parts, the uploaded body is written directly to a temporary file on disk rather than being constrained by the buffered in-memory upload limit. An unauthenticated attacker can therefore stream an arbitrarily large multipart file upload and consume unbounded disk space. This results in a denial of service condition for Rack applications that accept multipart form data. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34829
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-8vqr-qjwx-82mw
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21,rack - 2.2.23
CVE-2026-34827
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Multipart::Parser#handle_mime_head parses quoted multipart parameters such as Content-Disposition: form-data; name="..." using repeated String#index searches combined with String#slice! prefix deletion. For escape-heavy quoted values, this causes super-linear processing. An unauthenticated attacker can send a crafted multipart/form-data request containing many parts with long backslash-escaped parameter values to trigger excessive CPU usage during multipart parsing. This results in a denial of service condition in Rack applications that accept multipart form data. This issue has been patched in versions 3.1.21 and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34827
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-v6x5-cg8r-vv6x
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21
CVE-2026-34785
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Static determines whether a request should be served as a static file using a simple string prefix check. When configured with URL prefixes such as "/css", it matches any request path that begins with that string, including unrelated paths such as "/css-config.env" or "/css-backup.sql". As a result, files under the static root whose names merely share the configured prefix may be served unintentionally, leading to information disclosure. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34785
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-h2jq-g4cq-5ppq
Release Date: 2026-04-02
Fix Resolution: rack - 2.2.23,rack - 3.2.6,rack - 3.1.21
CVE-2026-22860
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, "Rack::Directory"’s path check used a string prefix match on the expanded path. A request like "/../root_example/" can escape the configured root if the target path starts with the root string, allowing directory listing outside the intended root. Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.
Publish Date: 2026-02-18
URL: CVE-2026-22860
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.1%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: rack/rack@75c5745
Release Date: 2026-02-17
Fix Resolution: https://github.com/rack/rack.git - v3.2.5,https://github.com/rack/rack.git - v3.1.20,https://github.com/rack/rack.git - v2.2.22
CVE-2025-61919
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, "Rack::Request#POST" reads the entire request body into memory for "Content-Type: application/x-www-form-urlencoded", calling "rack.input.read(nil)" without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using "query_parser.bytesize_limit", preventing unbounded reads of "application/x-www-form-urlencoded" bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx "client_max_body_size", Apache "LimitRequestBody").
Publish Date: 2025-10-10
URL: CVE-2025-61919
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.2%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-6xw4-3v39-52mm
Release Date: 2025-10-10
Fix Resolution: rack - 3.1.18,rack - 3.2.3,rack - 2.2.20
CVE-2025-61772
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, "Rack::Multipart::Parser" can accumulate unbounded data when a multipart part’s header block never terminates with the required blank line ("CRLFCRLF"). The parser keeps appending incoming bytes to memory without a size cap, allowing a remote attacker to exhaust memory and cause a denial of service (DoS). Attackers can send incomplete multipart headers to trigger high memory use, leading to process termination (OOM) or severe slowdown. The effect scales with request size limits and concurrency. All applications handling multipart uploads may be affected. Versions 2.2.19, 3.1.17, and 3.2.2 cap per-part header size (e.g., 64 KiB). As a workaround, restrict maximum request sizes at the proxy or web server layer (e.g., Nginx "client_max_body_size").
Publish Date: 2025-10-07
URL: CVE-2025-61772
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.2%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-wpv5-97wm-hp9c
Release Date: 2025-10-07
Fix Resolution: rack - 3.2.2,rack - 2.2.19,rack - 3.1.17,https://github.com/rack/rack.git - 2.2.19,https://github.com/rack/rack.git - v3.1.17,https://github.com/rack/rack.git - v3.2.2
CVE-2025-61771
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, ``Rack::Multipart::Parser"stores non-file form fields (parts without a"filename") entirely in memory as Ruby "String"objects. A single large text field in a multipart/form-data request (hundreds of megabytes or more) can consume equivalent process memory, potentially leading to out-of-memory (OOM) conditions and denial of service (DoS). Attackers can send large non-file fields to trigger excessive memory usage. Impact scales with request size and concurrency, potentially leading to worker crashes or severe garbage-collection overhead. All Rack applications processing multipart form submissions are affected. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a reasonable size cap for non-file fields (e.g., 2 MiB). Workarounds include restricting maximum request body size at the web-server or proxy layer (e.g., Nginx"client_max_body_size`) and validating and rejecting unusually large form fields at the application level.
Mend Note: The description of this vulnerability differs from MITRE.
Publish Date: 2025-10-07
URL: CVE-2025-61771
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.1%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-w9pc-fmgc-vxvw
Release Date: 2025-10-07
Fix Resolution: rack - 3.2.2,rack - 2.2.19,rack - 3.1.17,https://github.com/rack/rack.git - v2.2.19,https://github.com/rack/rack.git - v3.2.2,https://github.com/rack/rack.git - v3.1.17
CVE-2025-61770
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, "Rack::Multipart::Parser" buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger large transient memory spikes by including a long preamble in multipart/form-data requests. The impact scales with allowed request sizes and concurrency, potentially causing worker crashes or severe slowdown due to garbage collection. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a preamble size limit (e.g., 16 KiB) or discard preamble data entirely. Workarounds include limiting total request body size at the proxy or web server level and monitoring memory and set per-process limits to prevent OOM conditions.
Publish Date: 2025-10-07
URL: CVE-2025-61770
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.2%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: rack/rack@d869fed
Release Date: 2025-10-07
Fix Resolution: https://github.com/rack/rack.git - v2.2.19,rack - 2.2.19,rack - 3.1.17,https://github.com/rack/rack.git - v3.1.17,https://github.com/rack/rack.git - v3.2.2,rack - 3.2.2
CVE-2026-34830
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Sendfile#map_accel_path interpolates the value of the X-Accel-Mapping request header directly into a regular expression when rewriting file paths for X-Accel-Redirect. Because the header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex metacharacters and control the generated X-Accel-Redirect response header. In deployments using Rack::Sendfile with x-accel-redirect, this can allow an attacker to cause nginx to serve unintended files from configured internal locations. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34830
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.9)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-qv7j-4883-hwh7
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 2.2.23,rack - 3.1.21
CVE-2025-61780
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in "Rack::Sendfile" when running behind a proxy that supports "x-sendfile" headers (such as Nginx). Specially crafted headers could cause "Rack::Sendfile" to miscommunicate with the proxy and trigger unintended internal requests, potentially bypassing proxy-level access restrictions. When "Rack::Sendfile" received untrusted "x-sendfile-type" or "x-accel-mapping" headers from a client, it would interpret them as proxy configuration directives. This could cause the middleware to send a "redirect" response to the proxy, prompting it to reissue a new internal request that was not subject to the proxy's access controls. An attacker could exploit this by setting a crafted "x-sendfile-type: x-accel-redirect" header, setting a crafted "x-accel-mapping" header, and requesting a path that qualifies for proxy-based acceleration. Attackers could bypass proxy-enforced restrictions and access internal endpoints intended to be protected (such as administrative pages). The vulnerability did not allow arbitrary file reads but could expose sensitive application routes. This issue only affected systems meeting all of the following conditions: The application used "Rack::Sendfile" with a proxy that supports "x-accel-redirect" (e.g., Nginx); the proxy did not always set or remove the "x-sendfile-type" and "x-accel-mapping" headers; and the application exposed an endpoint that returned a body responding to ".to_path". Users should upgrade to Rack versions 2.2.20, 3.1.18, or 3.2.3, which require explicit configuration to enable "x-accel-redirect". Alternatively, configure the proxy to always set or strip the header, or in Rails applications, disable sendfile completely.
Mend Note: The description of this vulnerability differs from MITRE.
Publish Date: 2025-10-10
URL: CVE-2025-61780
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Changed
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-r657-rxjc-j557
Release Date: 2025-10-10
Fix Resolution: rack - 3.1.18,rack - 3.2.3,rack - 2.2.20
CVE-2026-25500
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, "Rack::Directory" generates an HTML directory index where each file entry is rendered as a clickable link. If a file exists on disk whose basename starts with the "javascript:" scheme (e.g. "javascript:alert(1)"), the generated index contains an anchor whose "href" is exactly "javascript:alert(1)". Clicking the entry executes JavaScript in the browser (demonstrated with "alert(1)"). Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.
Publish Date: 2026-02-18
URL: CVE-2026-25500
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.4)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: Low
- User Interaction: Required
- Scope: Changed
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: rack/rack@f2f225f
Release Date: 2026-02-17
Fix Resolution: https://github.com/rack/rack.git - v2.2.22,https://github.com/rack/rack.git - v3.2.5,https://github.com/rack/rack.git - v3.1.20
CVE-2026-34826
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.get_byte_ranges parses the HTTP Range header without limiting the number of individual byte ranges. Although the existing fix for CVE-2024-26141 rejects ranges whose total byte coverage exceeds the file size, it does not restrict the count of ranges. An attacker can supply many small overlapping ranges such as 0-0,0-0,0-0,... to trigger disproportionate CPU, memory, I/O, and bandwidth consumption per request. This results in a denial of service condition in Rack file-serving paths that process multipart byte range responses. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34826
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: Low
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-x8cg-fq8g-mxfx
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21,rack - 2.2.23
CVE-2026-34786
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Static#applicable_rules evaluates several header_rules types against the raw URL-encoded PATH_INFO, while the underlying file-serving path is decoded before the file is served. As a result, a request for a URL-encoded variant of a static path can serve the same file without the headers that header_rules were intended to apply. In deployments that rely on Rack::Static to attach security-relevant response headers to static content, this can allow an attacker to bypass those headers by requesting an encoded form of the path. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34786
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-q4qf-9j86-f5mh
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21,rack - 2.2.23
CVE-2026-34763
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Directory interpolates the configured root path directly into a regular expression when deriving the displayed directory path. If root contains regex metacharacters such as +, *, or ., the prefix stripping can fail and the generated directory listing may expose the full filesystem path in the HTML output. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34763
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-7mqq-6cf9-v2qp
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 2.2.23,rack - 3.1.21
CVE-2026-34230
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.select_best_encoding processes Accept-Encoding values with quadratic time complexity when the header contains many wildcard (*) entries. Because this method is used by Rack::Deflater to choose a response encoding, an unauthenticated attacker can send a single request with a crafted Accept-Encoding header and cause disproportionate CPU consumption on the compression middleware path. This results in a denial of service condition for applications using Rack::Deflater. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34230
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: Low
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-v569-hp3g-36wr
Release Date: 2026-04-02
Fix Resolution: rack - 3.1.21,rack - 3.2.6,rack - 2.2.23
CVE-2026-34835
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Request parses the Host header using an AUTHORITY regular expression that accepts characters not permitted in RFC-compliant hostnames, including /, ?, #, and @. Because req.host returns the full parsed value, applications that validate hosts using naive prefix or suffix checks can be bypassed. This can lead to host header poisoning in applications that use req.host, req.url, or req.base_url for link generation, redirects, or origin validation. This issue has been patched in versions 3.1.21 and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34835
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.1%
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-g2pf-xv49-m2h5
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21
CVE-2026-34831
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Files#fail sets the Content-Length response header using String#size instead of String#bytesize. When the response body contains multibyte UTF-8 characters, the declared Content-Length is smaller than the number of bytes actually sent on the wire. Because Rack::Files reflects the requested path in 404 responses, an attacker can trigger this mismatch by requesting a non-existent path containing percent-encoded UTF-8 characters. This results in incorrect HTTP response framing and may cause response desynchronization in deployments that rely on the incorrect Content-Length value. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34831
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-q2ww-5357-x388
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21,rack - 2.2.23
CVE-2026-32762
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21 and 3.2.0 to before 3.2.6, Rack::Utils.forwarded_values parses the RFC 7239 Forwarded header by splitting on semicolons before handling quoted-string values. Because quoted values may legally contain semicolons, a header can be interpreted by Rack as multiple Forwarded directives rather than as a single quoted for value. In deployments where an upstream proxy, WAF, or intermediary validates or preserves quoted Forwarded values differently, this discrepancy can allow an attacker to smuggle host, proto, for, or by parameters through a single header value. This issue has been patched in versions 3.1.21 and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-32762
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-qfgr-crr9-7r49
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21
CVE-2026-26962
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. From version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename or name instead of removing the folded line break during unfolding. As a result, applications that later reuse those parsed values in HTTP response headers may be vulnerable to downstream header injection or response splitting. This issue has been patched in version 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-26962
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-rx22-g9mx-qrhv
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6
CVE-2026-26961
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
- rack-test-2.2.0.gem (Root Library)
- ❌ rack-3.2.1.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser extracts the boundary parameter from multipart/form-data using a greedy regular expression. When a Content-Type header contains multiple boundary parameters, Rack selects the last one rather than the first. In deployments where an upstream proxy, WAF, or intermediary interprets the first boundary parameter, this mismatch can allow an attacker to smuggle multipart content past upstream inspection and have Rack parse a different body structure than the intermediary validated. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-26961
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (3.7)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-vgpv-f759-9wx3
Release Date: 2026-04-02
Fix Resolution: rack - 3.1.21,rack - 2.2.23,rack - 3.2.6
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Vulnerabilities
*For some transitive vulnerabilities, there is no version of direct dependency with a fix. Check the "Details" section below to see if there is a version of transitive dependency where vulnerability is fixed.
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENT_LENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfer encoding, multipart parsing continues until end-of-stream with no total size limit. For file parts, the uploaded body is written directly to a temporary file on disk rather than being constrained by the buffered in-memory upload limit. An unauthenticated attacker can therefore stream an arbitrarily large multipart file upload and consume unbounded disk space. This results in a denial of service condition for Rack applications that accept multipart form data. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34829
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-8vqr-qjwx-82mw
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21,rack - 2.2.23
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Multipart::Parser#handle_mime_head parses quoted multipart parameters such as Content-Disposition: form-data; name="..." using repeated String#index searches combined with String#slice! prefix deletion. For escape-heavy quoted values, this causes super-linear processing. An unauthenticated attacker can send a crafted multipart/form-data request containing many parts with long backslash-escaped parameter values to trigger excessive CPU usage during multipart parsing. This results in a denial of service condition in Rack applications that accept multipart form data. This issue has been patched in versions 3.1.21 and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34827
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-v6x5-cg8r-vv6x
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Static determines whether a request should be served as a static file using a simple string prefix check. When configured with URL prefixes such as "/css", it matches any request path that begins with that string, including unrelated paths such as "/css-config.env" or "/css-backup.sql". As a result, files under the static root whose names merely share the configured prefix may be served unintentionally, leading to information disclosure. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34785
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-h2jq-g4cq-5ppq
Release Date: 2026-04-02
Fix Resolution: rack - 2.2.23,rack - 3.2.6,rack - 3.1.21
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, "Rack::Directory"’s path check used a string prefix match on the expanded path. A request like "/../root_example/" can escape the configured root if the target path starts with the root string, allowing directory listing outside the intended root. Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.
Publish Date: 2026-02-18
URL: CVE-2026-22860
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.1%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: rack/rack@75c5745
Release Date: 2026-02-17
Fix Resolution: https://github.com/rack/rack.git - v3.2.5,https://github.com/rack/rack.git - v3.1.20,https://github.com/rack/rack.git - v2.2.22
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, "Rack::Request#POST" reads the entire request body into memory for "Content-Type: application/x-www-form-urlencoded", calling "rack.input.read(nil)" without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using "query_parser.bytesize_limit", preventing unbounded reads of "application/x-www-form-urlencoded" bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx "client_max_body_size", Apache "LimitRequestBody").
Publish Date: 2025-10-10
URL: CVE-2025-61919
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.2%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-6xw4-3v39-52mm
Release Date: 2025-10-10
Fix Resolution: rack - 3.1.18,rack - 3.2.3,rack - 2.2.20
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, "Rack::Multipart::Parser" can accumulate unbounded data when a multipart part’s header block never terminates with the required blank line ("CRLFCRLF"). The parser keeps appending incoming bytes to memory without a size cap, allowing a remote attacker to exhaust memory and cause a denial of service (DoS). Attackers can send incomplete multipart headers to trigger high memory use, leading to process termination (OOM) or severe slowdown. The effect scales with request size limits and concurrency. All applications handling multipart uploads may be affected. Versions 2.2.19, 3.1.17, and 3.2.2 cap per-part header size (e.g., 64 KiB). As a workaround, restrict maximum request sizes at the proxy or web server layer (e.g., Nginx "client_max_body_size").
Publish Date: 2025-10-07
URL: CVE-2025-61772
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.2%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-wpv5-97wm-hp9c
Release Date: 2025-10-07
Fix Resolution: rack - 3.2.2,rack - 2.2.19,rack - 3.1.17,https://github.com/rack/rack.git - 2.2.19,https://github.com/rack/rack.git - v3.1.17,https://github.com/rack/rack.git - v3.2.2
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, ``Rack::Multipart::Parser"stores non-file form fields (parts without a"filename") entirely in memory as Ruby "String"objects. A single large text field in a multipart/form-data request (hundreds of megabytes or more) can consume equivalent process memory, potentially leading to out-of-memory (OOM) conditions and denial of service (DoS). Attackers can send large non-file fields to trigger excessive memory usage. Impact scales with request size and concurrency, potentially leading to worker crashes or severe garbage-collection overhead. All Rack applications processing multipart form submissions are affected. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a reasonable size cap for non-file fields (e.g., 2 MiB). Workarounds include restricting maximum request body size at the web-server or proxy layer (e.g., Nginx"client_max_body_size`) and validating and rejecting unusually large form fields at the application level.
Mend Note: The description of this vulnerability differs from MITRE.
Publish Date: 2025-10-07
URL: CVE-2025-61771
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.1%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-w9pc-fmgc-vxvw
Release Date: 2025-10-07
Fix Resolution: rack - 3.2.2,rack - 2.2.19,rack - 3.1.17,https://github.com/rack/rack.git - v2.2.19,https://github.com/rack/rack.git - v3.2.2,https://github.com/rack/rack.git - v3.1.17
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, "Rack::Multipart::Parser" buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger large transient memory spikes by including a long preamble in multipart/form-data requests. The impact scales with allowed request sizes and concurrency, potentially causing worker crashes or severe slowdown due to garbage collection. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a preamble size limit (e.g., 16 KiB) or discard preamble data entirely. Workarounds include limiting total request body size at the proxy or web server level and monitoring memory and set per-process limits to prevent OOM conditions.
Publish Date: 2025-10-07
URL: CVE-2025-61770
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.2%
CVSS 3 Score Details (7.5)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: High
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: rack/rack@d869fed
Release Date: 2025-10-07
Fix Resolution: https://github.com/rack/rack.git - v2.2.19,rack - 2.2.19,rack - 3.1.17,https://github.com/rack/rack.git - v3.1.17,https://github.com/rack/rack.git - v3.2.2,rack - 3.2.2
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Sendfile#map_accel_path interpolates the value of the X-Accel-Mapping request header directly into a regular expression when rewriting file paths for X-Accel-Redirect. Because the header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex metacharacters and control the generated X-Accel-Redirect response header. In deployments using Rack::Sendfile with x-accel-redirect, this can allow an attacker to cause nginx to serve unintended files from configured internal locations. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34830
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.9)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: High
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-qv7j-4883-hwh7
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 2.2.23,rack - 3.1.21
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in "Rack::Sendfile" when running behind a proxy that supports "x-sendfile" headers (such as Nginx). Specially crafted headers could cause "Rack::Sendfile" to miscommunicate with the proxy and trigger unintended internal requests, potentially bypassing proxy-level access restrictions. When "Rack::Sendfile" received untrusted "x-sendfile-type" or "x-accel-mapping" headers from a client, it would interpret them as proxy configuration directives. This could cause the middleware to send a "redirect" response to the proxy, prompting it to reissue a new internal request that was not subject to the proxy's access controls. An attacker could exploit this by setting a crafted "x-sendfile-type: x-accel-redirect" header, setting a crafted "x-accel-mapping" header, and requesting a path that qualifies for proxy-based acceleration. Attackers could bypass proxy-enforced restrictions and access internal endpoints intended to be protected (such as administrative pages). The vulnerability did not allow arbitrary file reads but could expose sensitive application routes. This issue only affected systems meeting all of the following conditions: The application used "Rack::Sendfile" with a proxy that supports "x-accel-redirect" (e.g., Nginx); the proxy did not always set or remove the "x-sendfile-type" and "x-accel-mapping" headers; and the application exposed an endpoint that returned a body responding to ".to_path". Users should upgrade to Rack versions 2.2.20, 3.1.18, or 3.2.3, which require explicit configuration to enable "x-accel-redirect". Alternatively, configure the proxy to always set or strip the header, or in Rails applications, disable sendfile completely.
Mend Note: The description of this vulnerability differs from MITRE.
Publish Date: 2025-10-10
URL: CVE-2025-61780
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Changed
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-r657-rxjc-j557
Release Date: 2025-10-10
Fix Resolution: rack - 3.1.18,rack - 3.2.3,rack - 2.2.20
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, "Rack::Directory" generates an HTML directory index where each file entry is rendered as a clickable link. If a file exists on disk whose basename starts with the "javascript:" scheme (e.g. "javascript:alert(1)"), the generated index contains an anchor whose "href" is exactly "javascript:alert(1)". Clicking the entry executes JavaScript in the browser (demonstrated with "alert(1)"). Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.
Publish Date: 2026-02-18
URL: CVE-2026-25500
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.4)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: Low
- User Interaction: Required
- Scope: Changed
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: rack/rack@f2f225f
Release Date: 2026-02-17
Fix Resolution: https://github.com/rack/rack.git - v2.2.22,https://github.com/rack/rack.git - v3.2.5,https://github.com/rack/rack.git - v3.1.20
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.get_byte_ranges parses the HTTP Range header without limiting the number of individual byte ranges. Although the existing fix for CVE-2024-26141 rejects ranges whose total byte coverage exceeds the file size, it does not restrict the count of ranges. An attacker can supply many small overlapping ranges such as 0-0,0-0,0-0,... to trigger disproportionate CPU, memory, I/O, and bandwidth consumption per request. This results in a denial of service condition in Rack file-serving paths that process multipart byte range responses. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34826
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: Low
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-x8cg-fq8g-mxfx
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21,rack - 2.2.23
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Static#applicable_rules evaluates several header_rules types against the raw URL-encoded PATH_INFO, while the underlying file-serving path is decoded before the file is served. As a result, a request for a URL-encoded variant of a static path can serve the same file without the headers that header_rules were intended to apply. In deployments that rely on Rack::Static to attach security-relevant response headers to static content, this can allow an attacker to bypass those headers by requesting an encoded form of the path. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34786
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-q4qf-9j86-f5mh
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21,rack - 2.2.23
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Directory interpolates the configured root path directly into a regular expression when deriving the displayed directory path. If root contains regex metacharacters such as +, *, or ., the prefix stripping can fail and the generated directory listing may expose the full filesystem path in the HTML output. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34763
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: None
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-7mqq-6cf9-v2qp
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 2.2.23,rack - 3.1.21
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.select_best_encoding processes Accept-Encoding values with quadratic time complexity when the header contains many wildcard (*) entries. Because this method is used by Rack::Deflater to choose a response encoding, an unauthenticated attacker can send a single request with a crafted Accept-Encoding header and cause disproportionate CPU consumption on the compression middleware path. This results in a denial of service condition for applications using Rack::Deflater. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34230
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (5.3)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: Low
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-v569-hp3g-36wr
Release Date: 2026-04-02
Fix Resolution: rack - 3.1.21,rack - 3.2.6,rack - 2.2.23
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Request parses the Host header using an AUTHORITY regular expression that accepts characters not permitted in RFC-compliant hostnames, including /, ?, #, and @. Because req.host returns the full parsed value, applications that validate hosts using naive prefix or suffix checks can be bypassed. This can lead to host header poisoning in applications that use req.host, req.url, or req.base_url for link generation, redirects, or origin validation. This issue has been patched in versions 3.1.21 and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34835
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.1%
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-g2pf-xv49-m2h5
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Files#fail sets the Content-Length response header using String#size instead of String#bytesize. When the response body contains multibyte UTF-8 characters, the declared Content-Length is smaller than the number of bytes actually sent on the wire. Because Rack::Files reflects the requested path in 404 responses, an attacker can trigger this mismatch by requesting a non-existent path containing percent-encoded UTF-8 characters. This results in incorrect HTTP response framing and may cause response desynchronization in deployments that rely on the incorrect Content-Length value. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-34831
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-q2ww-5357-x388
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21,rack - 2.2.23
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21 and 3.2.0 to before 3.2.6, Rack::Utils.forwarded_values parses the RFC 7239 Forwarded header by splitting on semicolons before handling quoted-string values. Because quoted values may legally contain semicolons, a header can be interpreted by Rack as multiple Forwarded directives rather than as a single quoted for value. In deployments where an upstream proxy, WAF, or intermediary validates or preserves quoted Forwarded values differently, this discrepancy can allow an attacker to smuggle host, proto, for, or by parameters through a single header value. This issue has been patched in versions 3.1.21 and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-32762
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-qfgr-crr9-7r49
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6,rack - 3.1.21
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. From version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename or name instead of removing the folded line break during unfolding. As a result, applications that later reuse those parsed values in HTTP response headers may be vulnerable to downstream header injection or response splitting. This issue has been patched in version 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-26962
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (4.8)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-rx22-g9mx-qrhv
Release Date: 2026-04-02
Fix Resolution: rack - 3.2.6
Vulnerable Library - rack-3.2.1.gem
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
Library home page: https://rubygems.org/gems/rack-3.2.1.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /vendor/cache/rack-3.2.1.gem
Dependency Hierarchy:
Found in base branch: master
Vulnerability Details
Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser extracts the boundary parameter from multipart/form-data using a greedy regular expression. When a Content-Type header contains multiple boundary parameters, Rack selects the last one rather than the first. In deployments where an upstream proxy, WAF, or intermediary interprets the first boundary parameter, this mismatch can allow an attacker to smuggle multipart content past upstream inspection and have Rack parse a different body structure than the intermediary validated. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.
Publish Date: 2026-04-02
URL: CVE-2026-26961
Threat Assessment
Exploit Maturity: Not Defined
EPSS: 0.0%
CVSS 3 Score Details (3.7)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Impact Metrics:
- Confidentiality Impact: None
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-vgpv-f759-9wx3
Release Date: 2026-04-02
Fix Resolution: rack - 3.1.21,rack - 2.2.23,rack - 3.2.6