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Improper Handling of Case Sensitivity The advisory has been revoked - it doesn't affect any version of package rhcos  (opens in a new tab)

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EPSS
0.56% (47th percentile)

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  • Snyk IDSNYK-RHEL9-RHCOS-16353652
  • published3 May 2026
  • disclosed30 Apr 2026
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Introduced: 30 Apr 2026

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

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rhcos package and not the rhcos package as distributed by RHEL.

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.

References