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VULNERABILITIES

CVE-2026-67693 Details

Description

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). 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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://github.com/lkloliver/poc/tree/main/CVE-2026-67693 CVE
https://gist.github.com/lkloliver/6fbfc191bc6163942c8017551ac3f238 [email protected]
https://gitlab.com/gnutls/gnutls/-/blob/3.8.13/lib/x509/verify.c#L1119-1178 [email protected]
https://gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.md [email protected]
https://gitlab.com/gnutls/gnutls/-/work_items/1642 [email protected]

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionCISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

7 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-67693
NVD Published Date:
Oct 8, 2026
NVD Last Modified:
Nov 4, 2026
Source:
[email protected]
CVE-2026-67693 Details - Not Deferred