{"id":"CVE-2026-74890","aliases":["GHSA-rvc2-5jxq-gpcj"],"url":"https://o3.security/vulnerability/CVE-2026-74890","summary":"openssl_encrypt before 1.4.0 HMAC Authentication Bypass via Environment Variable","details":"openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in CamelliaCipher that disables HMAC tag generation and verification when the PYTEST_CURRENT_TEST environment variable is set. Attackers with code execution can set this environment variable to produce unauthenticated ciphertext and bypass integrity protection on encrypted data.","published":"2026-08-17T11:04:53.846Z","modified":"2026-08-18T03:56:18.246955499Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74890.json"},{"type":"ADVISORY","url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-rvc2-5jxq-gpcj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74890"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-hmac-authentication-bypass-via-environment-variable"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:18.246955499Z"}}