Description
GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. 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.
Published: 2026-10-08
Score: 4.8 Medium
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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History

Wed, 04 Nov 2026 05:30:00 +0000

Type Values Removed Values Added
References

Wed, 04 Nov 2026 04:30:00 +0000

Type Values Removed Values Added
Description Improper certificate validation in gnutls v3.8.13 causes the application to accept certificates containing invalid extensions. GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. 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.
References

Wed, 21 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Title Certificate Validation Bypass due to Invalid Extensions gnutls: gnutls: certificates with invalid extensions incorrectly accepted
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 19 Oct 2026 19:00:00 +0000

Type Values Removed Values Added
Title Certificate Validation Bypass due to Invalid Extensions

Mon, 19 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 09 Oct 2026 09:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 09 Oct 2026 07:30:00 +0000

Type Values Removed Values Added
First Time appeared Gnu
Gnu gnutls
Vendors & Products Gnu
Gnu gnutls

Thu, 08 Oct 2026 22:15:00 +0000

Type Values Removed Values Added
Title GnuTLS 3.8.13 improper certificate validation permits acceptance of certificates with invalid extensions

Thu, 08 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Title GnuTLS 3.8.13 improper certificate validation permits acceptance of certificates with invalid extensions

Thu, 08 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}


Thu, 08 Oct 2026 18:15:00 +0000

Type Values Removed Values Added
Description Improper certificate validation in gnutls v3.8.13 causes the application to accept certificates containing invalid extensions.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-11-04T04:54:27.527Z

Reserved: 2026-09-22T00:00:00.000Z

Link: CVE-2026-95210

cve-icon Vulnrichment

Updated: 2026-10-08T18:28:04.253Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-08T18:18:33.370

Modified: 2026-11-04T05:19:06.733

Link: CVE-2026-95210

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-08T00:00:00Z

Links: CVE-2026-95210 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-11-04T15:00:19Z

Weaknesses