Vulnerability in Jahlives OpenSSL Encrypt
CVE-2026-74900
openssl_encrypt versions before 1.4.0 contain a critical vulnerability in pqc.py where KEM decapsulation failures silently fall back to simulation mode, generating a deterministic shared secret from only 16 bytes of the private key and publicly available encapsulated key data. Attackers who obtain 16 bytes of the private key can compute the shared secret and decrypt all ciphertext, as the fallback triggers on any KEM failure without raising an error.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.002
Affected products
- Jahlives OpenSSL Encrypt — versions 0, 1.4.0
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-p3gq-pcg9-qvfv) (vendor-advisory, Mitigation, Vendor Advisory)
- VulnCheck Advisory: openssl_encrypt before 1.4.0 Weak Shared Secret via PQC Simulation Mode (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-74900?
- CVE-2026-74900 is a critical-severity vulnerability in Jahlives OpenSSL Encrypt, classified under CWE-391. CVSS score: 9.8/10. Published 2026-08-17.
- How severe is CVE-2026-74900?
- Critical severity. CVSS v3 base score is 9.8 out of 10.