{"id":"CVE-2026-74901","revision":"437dd7c422ef48f6b05e792771ef4cb6","records":[{"revision":"437dd7c422ef48f6b05e792771ef4cb6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74901","aliases":[],"title":"openssl_encrypt before 1.4.0 Authentication Bypass via AES-CTR Fallback","description":"openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in pqc.py where AES-GCM decryption failures trigger fallback to unauthenticated AES-CTR mode. Attackers can modify ciphertext in transit to bypass integrity verification and perform bit-flipping attacks without detection.","state":0,"publishedAt":"2026-08-17T11:04:59.916+00:00","modifiedAt":"2026-10-01T15:21:06.55+00:00","affected":[{"ecosystem":"Vendor product","name":"openssl_encrypt","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jahlives\",\n                    \"product\": \"openssl_encrypt\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/openssl_encrypt\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"1.4.0\"\n                        },\n                        {\n                            \"version\": \"1.4.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-w4j7-wfgw-r52w","https://www.vulncheck.com/advisories/openssl-encrypt-before-authentication-bypass-via-aes-ctr-fallback"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74901","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74901","identifiers":["CVE-2026-74901"]},"retained":false,"historicalAffected":[]}],"coverage":[]}