CVE-2026-3833

Published Apr 30, 2026

Last updated 4 days ago

CVSS medium 6.5

Overview

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
secalert@redhat.com
NVD status
Modified
Products
gnutls, hardened_images, openshift_container_platform, enterprise_linux

Risk scores

CVSS 3.1

Type
Primary
Base score
7.4
Impact score
5.2
Exploitability score
2.2
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Severity
HIGH

Weaknesses

secalert@redhat.com
CWE-178

Social media

Hype score
Not currently trending

Configurations

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References

Sources include official advisories and independent security research.