Vulnerabilities CVE-2026-74871

CVE-2026-74871

Medium

Open

TLP:CLEAR

openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XOR

NVD CVE.org

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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.

Details

CVSS Score: 6.9
CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Confidence: 90%
Published: Aug 17, 2026
Last Modified: Aug 17, 2026

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