What is CVE-2026-6330?

CVE-2026-6330 is a medium-severity vulnerability in Wolfssl, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 6.5/10. Published 2026-06-25.

How severe is CVE-2026-6330?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2026-6330 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Wolfssl

CVE-2026-6330

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 p…

Vulnerability class: POODLE (CVE-2014-3566)

EPSS: 0.001 (3.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Wolfssl — versions 5.7.4

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

Public proof-of-concept exploits

007bsd/ml-kem-key-recovery

References

facts@wolfssl.com (Patch, patch, Issue Tracking)
facts@wolfssl.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-6330?: CVE-2026-6330 is a medium-severity vulnerability in Wolfssl, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 6.5/10. Published 2026-06-25.
How severe is CVE-2026-6330?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2026-6330 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.