CVE-2026-74871CWE-916

CVE-2026-74871

Medium · published August 17, 2026

CVSS v3.1
6.2
EPSS
0%
Percentile
1.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.2 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
6.9 · 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
EPSS
0.00108 · 1.1th percentile
Weakness
CWE-916 · Use of Password Hash With Insufficient Computational Effort
Published
2026-08-17T15:16Z
Affected products (1)
ProductVersionsFixed in
jahlives/openssl_encrypt< 1.4.61.4.6
References (2)
https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vxf9-vwp6-2w43 · [email protected]https://www.vulncheck.com/advisories/openssl-encrypt-before-kdf-bypass-via-sequential-xor · [email protected]
EPSS history
Timeline
  • 17 AUG 11:04Z
    openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XOR
    cvelistv5