| Package | Affected versions | Patched versions |
|---|---|---|
| contracts | ≥ 4.1.0, < 4.7.1 | 4.7.1 |
| @openzeppelin/contracts | ≥ 4.1.0, < 4.7.1 | 4.7.1 |
| @openzeppelin/contracts-upgradeable | ≥ 4.1.0, < 4.7.1 | 4.7.1 |
SignatureChecker.isValidSignatureNow is not expected to revert. However, an incorrect assumption about Solidity 0.8's abi.decode allows some cases to revert, given a target contract that doesn't implement EIP-1271 as expected.
The contracts that may be affected are those that use SignatureChecker to check the validity of a signature and handle invalid signatures in a way other than reverting. We believe this to be unlikely.
The issue was patched in 4.7.1.
https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3552
If you have any questions or comments about this advisory, or need assistance deploying the fix, email us at [email protected].
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