MEDIUM 6.9 NVD
CVE-2026-74871
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. W
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
- https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vxf9-vwp6-2w43
- https://www.vulncheck.com/advisories/openssl-encrypt-before-kdf-bypass-via-sequential-xor
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-08-17 via NVD.
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