CVE-2026-74871

jahlives openssl_encrypt

Published 17 Aug 2026 · updated 10 Sept 2026 · Analyzed

6.9 Medium · CVSS 4.0, vulncheck.com

Description

openssl_encrypt versions before 1.4.6 contain a key derivation flaw in sequential XOR composition mode where the last stage cancels out during key generation. When configured with a single KDF and no prior hashing stage, attackers can bypass memory-hard key derivation and perform offline password cracking at SHA-256 speed instead of the configured KDF cost.

References

github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vxf9-vwp6-2w43 · Mitigation, Vendor Advisory
www.vulncheck.com/advisories/openssl-encrypt-before-kdf-bypass-via-sequential-xor · Third Party Advisory