{"id":"CVE-2023-23940","state":"PUBLISHED","title":"OpenZeppelin Contracts for Cairo is vulnerable to signature validation bypass","description":"OpenZeppelin Contracts for Cairo is a library for secure smart contract development written in Cairo for StarkNet, a decentralized ZK Rollup. `is_valid_eth_signature` is missing a call to `finalize_keccak` after calling `verify_eth_signature`. As a result, any contract using `is_valid_eth_signature` from the account library (such as the `EthAccount` preset) is vulnerable to a malicious sequencer. Specifically, the malicious sequencer would be able to bypass signature validation to impersonate an instance of these accounts. The issue has been patched in 0.6.1.\n","publishedAt":"2023-02-03T19:43:11.178Z","updatedAt":"2025-03-10T21:16:55.772Z","severity":{"score":6.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["OpenZeppelin cairo-contracts"],"affected":[{"vendor":"OpenZeppelin","product":"cairo-contracts","versions":[{"version":">= 0.2.0, < 0.6.1","status":"affected"}]}],"references":["https://github.com/OpenZeppelin/cairo-contracts/security/advisories/GHSA-626q-v9j4-mcp4","https://github.com/OpenZeppelin/cairo-contracts/pull/542/commits/6d4cb750478fca2fd916f73297632f899aca9299"],"weaknesses":["CWE-347","CWE-345"],"ingestedAt":"2026-10-29T20:05:43.909Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/23xxx/CVE-2023-23940.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-23940","state":"PUBLISHED","datePublished":"2023-02-03T19:43:11.178Z","dateUpdated":"2025-03-10T21:16:55.772Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2023-01-19T21:12:31.361Z"},"containers":{"cna":{"title":"OpenZeppelin Contracts for Cairo is vulnerable to signature validation bypass","descriptions":[{"lang":"en","value":"OpenZeppelin Contracts for Cairo is a library for secure smart contract development written in Cairo for StarkNet, a decentralized ZK Rollup. `is_valid_eth_signature` is missing a call to `finalize_keccak` after calling `verify_eth_signature`. 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