Improper Handling of Case Sensitivity Affecting gnutls-utils package, versions <0:3.8.3-8.amzn2023.0.3


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.11% (29th percentile)

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  • Snyk IDSNYK-AMZN2023-GNUTLSUTILS-16887762
  • published27 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 Amazon-Linux:2023 gnutls-utils to version 0:3.8.3-8.amzn2023.0.3 or higher.
This issue was patched in ALAS2023-2026-1757.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gnutls-utils package and not the gnutls-utils package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 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