{"id":"CVE-2026-74888","aliases":["PYSEC-2026-3764","GHSA-743f-89fg-x288"],"title":"openssl_encrypt versions before 1.4.0 use a non-standard PBKDF2 key derivation construction with iterations=1 per call in an outer loop, …","summary":"openssl_encrypt versions before 1.4.0 use a non-standard PBKDF2 key derivation construction with iterations=1 per call in an outer loop, creating a KDF whose security properties have not been formally analyzed. Attackers can exploit this…","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-2026-3764","references":[{"url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-743f-89fg-x288"},{"url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-non-standard-pbkdf2-key-derivation"}],"tags":["osv","pip"],"epss":0.00272,"epssPercentile":0.17439,"ingestedAt":"2026-09-02T19:31:25.578Z","slug":"CVE-2026-74888","body":"## Overview\n\nopenssl_encrypt versions before 1.4.0 use a non-standard PBKDF2 key derivation construction with iterations=1 per call in an outer loop, creating a KDF whose security properties have not been formally analyzed. Attackers can exploit this weakened key derivation to more efficiently crack passwords protecting legacy encrypted files compared to standard PBKDF2 implementations.\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":0.1,"exploitation":0,"ransomware":0},"changes":[]}