Vulnerability in Jahlives OpenSSL Encrypt
CVE-2026-74871
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.001 (1.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Jahlives OpenSSL Encrypt — versions 0, 1.4.6
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-vxf9-vwp6-2w43) (vendor-advisory, Mitigation, Vendor Advisory)
- VulnCheck Advisory: openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XOR (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-74871?
- CVE-2026-74871 is a medium-severity vulnerability in Jahlives OpenSSL Encrypt, classified under Use of Password Hash With Insufficient Computational Effort. CVSS score: 6.2/10. Published 2026-08-17.
- How severe is CVE-2026-74871?
- Medium severity. CVSS v3 base score is 6.2 out of 10.