Add advisory for segmentation fault in fast-float and fast-float2 (#2192)

* Add advisory for segmentation fault in fast-float

* Add advisory for segmentation fault in fast-float2

* Note that access is read-only and that a patch is available

* Same for fast-float2

---------

Co-authored-by: Sergey "Shnatsel" Davidoff <[email protected]>

Author: nyw0102

crates/fast-float/RUSTSEC-0000-0000.md

@@ -0,0 +1,22 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "fast-float"
+date = "2025-01-13"
+url = "https://github.com/aldanor/fast-float-rust/issues/38"
+categories = ["memory-exposure"]
+
+[affected]
+functions = { "fast_float::common::AsciiStr::first" = ["*"] }
+
+[versions]
+patched = []
+```
+# Segmentation fault due to lack of bound check
+In this case, the "fast_float::common::AsciiStr::first" method within the "AsciiStr" struct 
+uses the unsafe keyword to reading from memory without performing bounds checking. 
+Specifically, it directly dereferences a pointer offset by "self.ptr".
+Because of the above reason, the method accesses invalid memory address when it takes an empty string as its input.
+This approach violates Rust’s memory safety guarantees, as it can lead to invalid memory access if empty buffer is provided.
+
+No patched version for fast-float crate has been released, but a patch is available in the fast-float2 fork.

crates/fast-float2/RUSTSEC-0000-0000.md

@@ -0,0 +1,20 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "fast-float2"
+date = "2025-01-13"
+url = "https://github.com/aldanor/fast-float-rust/issues/38"
+categories = ["memory-exposure"]
+
+[affected]
+functions = { "fast_float2::common::AsciiStr::first" = ["<0.2.2"] }
+
+[versions]
+patched = [">=0.2.2"]
+```
+# Segmentation fault due to lack of bound check
+In this case, the "fast_float2::common::AsciiStr::first" method within the "AsciiStr" struct 
+uses the unsafe keyword to reading from memory without performing bounds checking. 
+Specifically, it directly dereferences a pointer offset by "self.ptr".
+Because of the above reason, the method accesses invalid memory address when it takes an empty string as its input.
+This approach violates Rust’s memory safety guarantees, as it can lead to invalid memory access if empty buffer is provided.