🛡️ CVE-2026-3833 — enterprise-linux

🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-178 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

Affected software

CVE-2026-3833 is recorded against 4 packages.

  • enterprise-linux
  • gnutls
  • hardened-images
  • openshift-container-platform

Timeline and source

Published on 30 April 2026 and last revised on 22 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

access.redhat.com
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CVE-2026-3833 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE CWE-178
Public Exploit ⚠️ Yes
Source NVD
Published 2026-04-30
Updated 2026-08-11
Modified 2026-07-22
Fix URL N/A

Affected Packages

Software From version Fixed in
enterprise-linux
gnutls
hardened-images
openshift-container-platform

References

Issue Tracking, Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13274
Issue Tracking, Third Party Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2445763
Exploit, Issue Tracking, Vendor Advisory https://gitlab.com/gnutls/gnutls/-/issues/1803
Exploit, Issue Tracking, Vendor Advisory https://gitlab.com/gnutls/gnutls/-/issues/1803

Similar Threats

Exploit Protection

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