CVE-2026-6330: wolfSSL

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

The ML-KEM ARM64 NEON ciphertext comparison only compares half of the input, breaking the Fujisaki-Okamoto transform's implicit rejection and weakening IND-CCA2 security on that code path. The constant-time comparison effectively ignored part of the re-encrypted ciphertext, so a decapsulating party could fail to detect a manipulated ciphertext and proceed without the standard's required implicit rejection.

Affected products

• wolfSSL wolfSSL: from 5.7.4, before 5.9.2 (fixed in 5.9.2)

Published 2026-06-25. Last modified 2026-06-27.