CVE-2026-67693

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-10-08 19:18 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-04 05:19 UTC Last updatedMost recent change to the record

Details

Published

2026-10-08 19:18 UTC

Last modified

2026-11-04 05:19 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-367

Record status

Awaiting Analysis

Attack profile CVSS 3.1 · 3.7

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None