CVE-2026-74871 — openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XOR
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 wi…
Published: 2026-08-17 · CVSS: 6.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7