An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU)

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Gnu
  • Gnutls

No data.

No data.

References
Link Providers
http://gnutls.com cve-icon cve-icon cve-icon
https://gist.github.com/lkloliver/6fbfc191bc6163942c8017551ac3f238 cve-icon cve-icon cve-icon
https://gitlab.com/gnutls/gnutls/-/blob/3.8.13/lib/x509/verify.c#L1119-1178 cve-icon cve-icon cve-icon
https://gitlab.com/gnutls/gnutls/-/work_items/1642 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-67693 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-67693 cve-icon
History

Mon, 19 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

 cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}

ssvc

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

Fri, 16 Oct 2026 18:00:00 +0000

Type Values Removed Values Added
References

Fri, 09 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-367
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Fri, 09 Oct 2026 07:45:00 +0000

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

Fri, 09 Oct 2026 03:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-332
CWE-749

Fri, 09 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
Title Certificate Validation Failure Allows Sensitive Information Disclosure in gnutls 3.8.13 gnutls: gnutls: Information disclosure via contradictory Key Usage and Extended Key Usage extensions
Weaknesses CWE-295
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

threat_severity

Moderate

Thu, 08 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
Title Certificate Validation Failure Allows Sensitive Information Disclosure in gnutls 3.8.13
Weaknesses CWE-332
CWE-749

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

Type Values Removed Values Added
Description An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU)
References
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-10-08T00:00:00.000Z

Updated: 2026-10-19T15:04:22.785Z

Reserved: 2026-07-30T00:00:00.000Z

Link: CVE-2026-67693

cve-icon Vulnrichment

Updated: 2026-10-09T11:26:04.884Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-08T19:18:41.280

Modified: 2026-10-19T15:17:07.243

Link: CVE-2026-67693

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2026-67693 - Bugzilla