{"id":"CVE-2026-81687","title":"openssl_encrypt versions before 1.4.9 fail to enforce a time ceiling on key derivation function iteration counts specified in file metadata","summary":"openssl_encrypt versions before 1.4.9 fail to enforce a time ceiling on key derivation function iteration counts specified in file metadata. Attackers can craft files with extremely high KDF iteration counts to consume CPU resources for …","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-400"],"published":"2026-08-27","updated":"2026-09-23","sourceUpdated":"2026-09-23T17:17:42.653","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81687","references":[{"url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-rv6w-7hq9-pr74","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-denial-of-service-via-kdf","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00208,"epssPercentile":0.11308,"ingestedAt":"2026-09-23T17:28:14.808Z","slug":"CVE-2026-81687","body":"## Overview\n\nopenssl_encrypt versions before 1.4.9 fail to enforce a time ceiling on key derivation function iteration counts specified in file metadata. Attackers can craft files with extremely high KDF iteration counts to consume CPU resources for unbounded periods before password verification occurs.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}