Vulnerability in Gnu Gnutls

CVE-2026-3833

A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permit…

EPSS: 0.001 (31.8th 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

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-3833?
CVE-2026-3833 is a medium-severity vulnerability in Gnu Gnutls, classified under Improper Handling of Case Sensitivity. CVSS score: 6.5/10. Published 2026-04-30.
How severe is CVE-2026-3833?
Medium severity. CVSS v3 base score is 6.5 out of 10.