CVE-2023-49798

Summary

CVE-2023-49798 affects OpenZeppelin Contracts, a popular library for smart contract development. A merge issue during the porting process of the 5.0.1 patch to the 4.9 branch resulted in a line duplication. This issue, present in versions 4.9.4 of `Multicall.sol` for `@openzeppelin/contracts` and `@openzeppelin/contracts-upgradeable`, leads to all subcalls being executed twice. Users may unknowingly duplicate operations like asset transfers. The duplicate delegatecall was rectified in version 4.9.5. However, users of the 4.9.4 version are advised to upgrade as soon as possible. No workarounds are available for this vulnerability.

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