CVE-2026-74900: jahlives openssl_encrypt

CVSS 9.8 (critical) · published 2026-08-17

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.

Affected products (NVD): jahlives openssl_encrypt

Fixed in (NVD): 1.4.0

Weakness: CWE-391

Source: NVD CVE-2026-74900

References

• https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-p3gq-pcg9-qvfv
• https://www.vulncheck.com/advisories/openssl-encrypt-before-weak-shared-secret-via-pqc-simulation-mode

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