High 7.5Published Oct 8, 2026

CVE-2026-67693An 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 Exten…

Updated under an hour ago (2026-10-19 06:50 UTC)

Does this affect you?

It lists no affected products yet. Add what you run and Signals checks it as products are added.

EPSS puts the chance of exploitation in the next 30 days at 0.19%, higher than 8% of scored CVEs.

Do this next

Start free and add your stack

Free account, 1 product

Exploited in the last 30 days

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)

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-367
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.19% (percentile 8)
Assigned by: mitre
NVD analysis: Awaiting Analysis
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

No affected products are listed yet.

References

http://gnutls.com
https://gitlab.com/gnutls/gnutls/-/blob/3.8.13/lib/x509/verify.c#L1119-1178
https://gist.github.com/lkloliver/6fbfc191bc6163942c8017551ac3f238
https://gitlab.com/gnutls/gnutls/-/work_items/1642

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.