CVE-2026-6330 — ML-KEM ARM64 NEON ciphertext comparison only compares half of the input
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…
Published: 2026-06-25 · CVSS: 6.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7