CVE-2026-6330mediumCWE-327

CVE-2026-6330: medium-severity vulnerability in wolfSSL

ML-KEM ARM64 NEON ciphertext comparison only compares half of the input

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33Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 6.3epss 0.2%
from disclosure to weapon27 days
Published on NVDJun 25
1st PoC+27d
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.
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
Affected products
wolfSSL · wolfSSL
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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