{"id":"CVE-2026-74890","aliases":["PYSEC-2026-3766","GHSA-rvc2-5jxq-gpcj"],"title":"openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in CamelliaCipher that disables HMAC tag generation …","summary":"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 execu…","severity":"none","vendor":"openssl-encrypt","product":"openssl-encrypt","ecosystem":"pip","affected":["openssl-encrypt < 1.4.0"],"patched":["openssl-encrypt 1.4.0"],"published":"2026-08-17","updated":"2026-09-02","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/PYSEC-2026-3766","references":[{"url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-rvc2-5jxq-gpcj"},{"url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-hmac-authentication-bypass-via-environment-variable"}],"tags":["osv","pip"],"epss":0.00213,"epssPercentile":0.10296,"ingestedAt":"2026-09-02T19:31:25.660Z","slug":"CVE-2026-74890","body":"## Overview\n\nopenssl_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.\n\n## Affected packages\n\n- `openssl-encrypt < 1.4.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `openssl-encrypt 1.4.0`","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}