{"id":"CVE-2026-74889","title":"openssl_encrypt before 1.4.0 Weak Key Derivation via HKDF","summary":"openssl_encrypt versions before 1.4.0 use HKDF with no salt and static info parameter in key normalization functions, reducing entropy extraction and determinism. Attackers can exploit predictable key derivation with identical inputs to …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-326"],"vendor":"jahlives","product":"openssl_encrypt","affected":["openssl_encrypt < 1.4.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-08-17T16:00:53.861001Z"},"published":"2026-08-17","updated":"2026-10-01","sourceUpdated":"2026-10-01T15:20:59.922Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74889","references":[{"url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-j9mh-57cc-665x","label":"GitHub Security Advisory (GHSA-j9mh-57cc-665x)"},{"url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-weak-key-derivation-via-hkdf","label":"VulnCheck Advisory: openssl_encrypt before 1.4.0 Weak Key Derivation via HKDF"}],"tags":["cve.org","osv","pip"],"epss":0.00348,"epssPercentile":0.28227,"aliases":["PYSEC-2026-3765","GHSA-j9mh-57cc-665x"],"ecosystem":"pip","patched":["openssl-encrypt 1.4.0"],"ingestedAt":"2026-09-02T19:31:25.619Z","slug":"CVE-2026-74889","body":"## Overview\n\nopenssl_encrypt versions before 1.4.0 use HKDF with no salt and static info parameter in key normalization functions, reducing entropy extraction and determinism. Attackers can exploit predictable key derivation with identical inputs to weaken cryptographic security against multi-target attacks.\n\n## Affected\n\n- `openssl_encrypt < 1.4.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-74889)\n\nAffected packages:\n\n- `openssl-encrypt < 1.4.0`\n\nPatched in:\n\n- `openssl-encrypt 1.4.0`\n\nSource: https://osv.dev/vulnerability/PYSEC-2026-3765","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":214457,"id":"CVE-2026-74889","ts":1790869826406,"field":"cvss","old":null,"new":"9.8"},{"seq":214456,"id":"CVE-2026-74889","ts":1790869826406,"field":"severity","old":"none","new":"critical"}]}