Is CVE-2026-74871 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-74871?

CVE-2026-74871 has a CVSS v3 severity of MEDIUM (6.2).

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CVE-2026-74871

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.