Improper Handling of Case Sensitivity Affecting gnutls package, versions <0:3.6.16-8.el8_10.6


Severity

Recommended
high

Based on CentOS security rating.

Threat Intelligence

EPSS
0.11% (29th percentile)

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  • Snyk IDSNYK-CENTOS8-GNUTLS-16354165
  • published3 May 2026
  • disclosed30 Apr 2026

Introduced: 30 Apr 2026

CVE-2026-3833  (opens in a new tab)
CWE-178  (opens in a new tab)

How to fix?

Upgrade Centos:8 gnutls to version 0:3.6.16-8.el8_10.6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gnutls package and not the gnutls package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1