CVE-2026-74900openssl_encrypt before 1.4.0 Weak Shared Secret via PQC Simulation Mode
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-391
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Oct 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
jahlives openssl_encrypt jahlives:openssl_encrypt (from the name) | before 1.4.0; 1.4.0 not affected | CNA record |
jahlives openssl_encrypt jahlives:openssl_encrypt | before 1.4.0 | NVD |
References
- https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-p3gq-pcg9-qvfvvendor-advisory, mitigation
- https://www.vulncheck.com/advisories/openssl-encrypt-before-weak-shared-secret-via-pqc-simulation-modethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.