OpenZeppelin Contracts is a library for smart contract development. Versions 4.1.0 until 4.7.1 are vulnerable to the SignatureChecker reverting. `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. The issue was patched in version 4.7.1.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| @openzeppelin/contracts(npm) | 4.1.0 | 4.7.1 | N/A |
| @openzeppelin/contracts-upgradeable(npm) | 4.1.0 | 4.7.1 | N/A |
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