CVE-2026-95209
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GnuTLS CA Certificate Validation Denial of Service

Publication date: 2026-10-08

Last updated on: 2026-10-08

Assigner: MITRE

Description
An issue in gnutls v3.8.13 causes legitimate CA certificates to be rejected, leading to a Denial of Service (DoS).

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Meta Information

Published
2026-10-08
Last Modified
2026-10-08
Generated
2026-10-09
AI Q&A
2026-10-08
EPSS Evaluated
N/A
NVD
CVE-2026-95209
EUVD
EUVD-2026-95204

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Showing 1 associated CPE
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Exploitability

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

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Executive Summary

This vulnerability in GnuTLS v3.8.13 causes legitimate Certificate Authority (CA) certificates to be incorrectly rejected. This leads to a Denial of Service (DoS) because systems using GnuTLS cannot verify trusted certificates, disrupting secure communications and authentication processes.

Detection Guidance

Check GnuTLS version with 'gnutls-cli --version' or 'dpkg -l | grep gnutls'. If version 3.8.13 is installed, the system is vulnerable. Inspect certificate chains for CA constraints and missing SANs using 'openssl verify -verbose -CAfile <ca-cert> <server-cert>'.

Impact Analysis

If you use systems or applications relying on GnuTLS v3.8.13, this vulnerability could prevent secure connections from being established. This may result in service disruptions, failed authentication attempts, or inability to access critical services that depend on certificate validation.

Compliance Impact

This vulnerability could impact compliance by disrupting secure data transmission and authentication. For GDPR, it may affect data integrity and confidentiality requirements. For HIPAA, it could compromise secure communications in healthcare systems, potentially violating privacy and security rules.

Mitigation Strategies

Upgrade GnuTLS to a patched version if available. Temporarily disable strict certificate validation in GnuTLS clients if feasible. Replace affected CA certificates with ones that do not enforce dNSName constraints without SANs.

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