CVE-2026-74871
MediumCVSS 6.2Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
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.
Risk Assessment
Attackers can crack passwords faster, potentially leading to compromise of data protected by those passwords.
Recommendation
Update openssl_encrypt to version 1.4.6 or later and configure multiple KDF stages or hashing before KDF to avoid this flaw.
Original NVD description (English source)
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.