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Affected Component
Analysis
gnutls
Patched
Name
CVE-2026-3833
Description
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 `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.
CWEs
Published Date
Updated Date
Workaround
-
Advisories
https://access.redhat.com/errata/RHSA-2026:13274Issue Tracking
https://access.redhat.com/security/cve/CVE-2026-3833Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2445763Issue Tracking
Analysis#
Vulnerability Ratings#
6.5
CVSSv31
7.4
CVSSv31
NaN
other
Others affected components#
Resolved with patches#
gnutls (yocto:scarthgap)
#
Title
Author
Resolve
1
x509/name-constraints: compare domain names case-insensitive
Alexander Sosedkin <asosedkin@redhat.com>
CVE-2026-3833