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CVE-2026-3833 Details

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.

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References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://gitlab.com/gnutls/gnutls/-/issues/1803 CISA-ADPExploitIssue TrackingVendor Advisory
https://access.redhat.com/errata/RHSA-2026:13274 [email protected]Issue TrackingThird Party Advisory
https://access.redhat.com/errata/RHSA-2026:20611 [email protected]
https://access.redhat.com/errata/RHSA-2026:20612 [email protected]
https://access.redhat.com/errata/RHSA-2026:20613 [email protected]

see all 26 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-178Improper Handling of Case Sensitivity[email protected]

Affected Products

ProductVersions
gnu gnutls
All versions

CPE

  • cpe:2.3:a:gnu:gnutls:-:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
redhat hardened images
All versions

CPE

  • cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
redhat openshift container platform
4.0

CPE

  • cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
redhat enterprise linux
6.0
7.0
8.0
9.0
10.0

CPE

  • cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

30 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-3833
NVD Published Date:
Apr 30, 2026
NVD Last Modified:
Sep 17, 2026
Source:
[email protected]
CVE-2026-3833 Details - Not Deferred