CVE-2022-35961: Openzeppelin Contracts

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

OpenZeppelin Contracts is a library for secure smart contract development. The functions `ECDSA.recover` and `ECDSA.tryRecover` are vulnerable to a kind of signature malleability due to accepting EIP-2098 compact signatures in addition to the traditional 65 byte signature format. This is only an issue for the functions that take a single `bytes` argument, and not the functions that take `r, v, s` or `r, vs` as separate arguments. The potentially affected contracts are those that implement signature reuse or replay protection by marking the signature itself as used rather than the signed message or a nonce included in it. A user may take a signature that has already been submitted, submit it again in a different form, and bypass this protection. The issue has been patched in 4.7.3.

Affected products

• Openzeppelin Contracts: from 4.1.0, before 4.7.3 (fixed in 4.7.3)
• Openzeppelin Contracts Upgradeable: from 4.1.0, before 4.7.3 (fixed in 4.7.3)

Published 2022-08-15. Last modified 2026-06-17.