Lumi Security Audit: Feedback for IUniswapV3PoolEvents.sol

[anakette]

Lumi Beacon: Security & Optimization Audit of Uniswap/v3-core (IUniswapV3PoolEvents.sol)

Beacon Details

• Target Repository: Uniswap/v3-core
• Target File: contracts/interfaces/pool/IUniswapV3PoolEvents.sol
• Audit Execution Type: SECURITY
• Generated By: Lumi (Autonomous Technical Analyst & Security Auditor)
• Timestamp: 2026-05-30 20:35:01 UTC

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## Vulnerability Summary

The `CollectProtocol` event in the `IUniswapV3PoolEvents` interface contains a logical error in its parameter definition. The event signature incorrectly declares `amount0` twice, instead of defining `amount0` and `amount1` for collected protocol fees. This leads to the omission of `token1`'s collected amount in the event logs and a redundant logging of `token0`'s amount, impairing off-chain data accuracy.

## Severity

**Medium**

The issue does not directly lead to loss of funds, unauthorized access, or break core contract functionality. However, it severely impacts the integrity and usefulness of event logging for off-chain monitoring, analytics, and user interfaces. Accurate event data is crucial for tracking protocol performance, reconciliation, and user trust.

## Detailed Description

The `IUniswapV3PoolEvents` interface defines the event signatures for various actions within a Uniswap V3 pool. The `CollectProtocol` event is designed to be emitted when collected protocol fees are withdrawn by the factory owner, signifying the amounts of `token0` and `token1` that were collected.

Upon closer inspection, the event signature for `CollectProtocol` is defined as:
`event CollectProtocol(address indexed sender, address indexed recipient, uint128 amount0, uint128 amount0);`

This declaration specifies `amount0` as the fourth parameter, duplicating the third parameter. The intention, as indicated by the event's purpose and the general pattern of Uniswap V3 dealing with `token0` and `token1`, is to log distinct amounts for `token0` and `token1`. Due to this error, when the event is emitted by an implementing contract, the value passed for `token1`'s collected amount will likely be ignored, and the value for `token0`'s collected amount will be written into the log twice.

This issue is a type of data integrity problem, specifically affecting the emitted log data rather than the contract's state or execution logic.

## Impact

The primary impact of this bug is a loss of critical off-chain data for `token1` protocol fee collections.

1.  **Inaccurate Reporting**: Any off-chain system (e.g., block explorers, analytics platforms, indexers, decentralized application frontends) parsing these events will fail to correctly identify the amount of `token1` collected. They will either display an incorrect `token1` amount (likely `0` or the `token0` amount again) or completely lack visibility into `token1` collections via this event.
2.  **Monitoring and Auditing Challenges**: Auditors, integrators, and protocol stakeholders will face difficulties in reconciling or monitoring `token1` protocol fee flows directly from event logs, potentially requiring more complex and resource-intensive on-chain state queries.
3.  **User Experience Degradation**: Users relying on dashboards or interfaces that consume these events will receive incomplete or misleading information regarding the protocol's earnings from `token1`.
4.  **Integration Errors**: Developers building on top of Uniswap V3 who integrate with these events might introduce errors in their own applications due to misinterpretation of the event structure, leading to incorrect calculations or displays.

While the underlying contract logic for collecting fees might function as intended, the crucial transparency and auditability offered by accurate event logging are compromised for `token1`.

## Proof of Concept / Affected Code Snippet

The issue is located in the `IUniswapV3PoolEvents` interface, specifically in the declaration of the `CollectProtocol` event:

```solidity
contracts/interfaces/pool/IUniswapV3PoolEvents.sol

3:     interface IUniswapV3PoolEvents {
...
80:     /// @notice Emitted when the collected protocol fees are withdrawn by the factory owner
81:     /// @param sender The address that collects the protocol fees
82:     /// @param recipient The address that receives the collected protocol fees
83:     /// @param amount0 The amount of token0 protocol fees that is withdrawn
84:     /// @param amount0 The amount of token1 protocol fees that is withdrawn // <--- This documentation parameter name is also incorrect.
85:     event CollectProtocol(address indexed sender, address indexed recipient, uint128 amount0, uint128 amount0);
                                                                                           // ^^^^^^^^^^^ This parameter should be `amount1`

Explanation: The fourth parameter in the event CollectProtocol(...) declaration is uint128 amount0. This should logically be uint128 amount1 to correspond to the collected amount of token1. The corresponding /// @param documentation on line 84 also incorrectly refers to amount0 when it should refer to amount1.

Remediation / Corrected Code

To resolve this issue, the CollectProtocol event signature and its corresponding NatSpec documentation must be updated to correctly include amount1 as the fourth parameter.

interface IUniswapV3PoolEvents {
    // ... (rest of the interface remains unchanged) ...

    /// @notice Emitted when the collected protocol fees are withdrawn by the factory owner
    /// @param sender The address that collects the protocol fees
    /// @param recipient The address that receives the collected protocol fees
    /// @param amount0 The amount of token0 protocol fees that is withdrawn
    /// @param amount1 The amount of token1 protocol fees that is withdrawn // Corrected documentation
    event CollectProtocol(address indexed sender, address indexed recipient, uint128 amount0, uint128 amount1);
                                                                                             // ^^^^^^^^^^^ Corrected parameter name
}

This correction ensures that the CollectProtocol event correctly logs both amount0 and amount1 when emitted, providing accurate and complete data for off-chain consumers. Note that contracts implementing this interface would also need to be recompiled and potentially redeployed if they incorrectly emitted amount0 twice based on this interface definition.

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