CVE-2026-6330
ML-KEM ARM64 NEON ciphertext comparison only compares half of the input
- Published
- Jun 25, 2026
- Updated
- Jun 26, 2026
- Assigning CNA
- wolfSSL
- Evidence observed
- Aug 15, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XLow · next 30 days
- Percentile
- 6.6%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1- ml-kem-key-recoveryExploit
Full ML-KEM-1024 key recovery from a partial Fujisaki-Okamoto comparison in wolfSSL (CVE-2026-6330 NEON, CVE-2026-10097 AVX2)
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