CVE-2026-95184

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BaseFortify

Publication date: 2026-10-08

Last updated on: 2026-11-04

Assigner: MITRE

Description

GnuTLS v3.8.13 does not properly enforce name constraints, as demonstrated by a permitted subtree violation for "EE O=Evil accepted although outside permitted O=Good." NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

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Meta Information

Published

2026-10-08

Last Modified

2026-11-04

Generated

2026-11-08

AI Q&A

2026-10-08

EPSS Evaluated

2026-11-07

NVD

CVE-2026-95184

EUVD

EUVD-2026-95140

Affected Vendors & Products

Vendor	Product	Version / Range
n/a	n/a	n/a

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This vulnerability is an improper certificate validation flaw in GnuTLS version 3.8.13. It causes the application to incorrectly reject legitimate certificates for valid users, resulting in a Denial of Service (DoS). The issue stems from a failure to enforce permittedSubtrees constraints for directoryName and URI name forms in certificate validation.

Detection Guidance

To detect this vulnerability, check if your system uses GnuTLS version 3.8.13. Run 'gnutls-cli --version' to verify the installed version. If vulnerable, inspect certificate chains for permittedSubtrees constraints violations in directoryName or URI forms.

Impact Analysis

This vulnerability allows an attacker controlling a subordinate Certificate Authority (CA) to issue end-entity certificates outside the permitted namespace. GnuTLS-based clients would accept these certificates, enabling impersonation of organizations or URI domains that the constraints were meant to restrict. This could lead to unauthorized access or service disruption.

Compliance Impact

This vulnerability could undermine compliance with GDPR and HIPAA by allowing unauthorized certificate issuance outside permitted namespaces. Attackers could impersonate organizations or domains, potentially violating data protection requirements for secure authentication and access control.

Mitigation Strategies

Upgrade GnuTLS to a patched version immediately. Avoid using GnuTLS 3.8.13. If upgrading is not possible, disable certificate validation temporarily as a last resort.

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