CVE-2026-3833

6.5 MEDIUM

A flaw was found in gnutls

Published: 2026-04-30 · Last updated: 2026-06-02

Severity and scoring

CVSS: 6.5 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE: CWE-178

Affected products

Vendor	Product
gnu	enterprise_linux, gnutls, hardened_images
redhat	enterprise_linux, gnutls, hardened_images

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-3833
[Other]https://access.redhat.com/errata/RHSA-2026:13274
[Other]https://access.redhat.com/errata/RHSA-2026:20611
[Other]https://access.redhat.com/errata/RHSA-2026:20612
[Other]https://access.redhat.com/errata/RHSA-2026:20613
[Other]https://access.redhat.com/security/cve/CVE-2026-3833
[Other]https://bugzilla.redhat.com/show_bug.cgi?id=2445763
[Vendor advisory]https://gitlab.com/gnutls/gnutls/-/issues/1803
[Vendor advisory]https://gitlab.com/gnutls/gnutls/-/issues/1803

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