CVE-2023-40014

Summary

CVE-2023-40014 affects OpenZeppelin Contracts, a popular library for secure smart contract development. The issue, present in versions 4.0.0 through 4.9.2, affects contracts utilizing `ERC2771Context` in conjunction with custom trusted forwarders. In such cases, calls originating from the forwarder with calldata under 20 bytes may result in `_msgSender` returning the address `0x0`. This scenario is uncommon and hasn't been observed in common forwarders like `MinimalForwarder`. The vulnerability has been resolved in version 4.9.3.

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