Low severity · published Oct 8, 2026
CVE-2026-67693
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…
3.7
CVSS
0.2%
EPSS
No
On KEV
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)
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67693
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-67693
gnutls.com
http://gnutls.com
gitlab.com
https://gitlab.com/gnutls/gnutls/-/blob/3.8.13/lib/x509/verify.c#L1119-1178
gist.github.com
https://gist.github.com/lkloliver/6fbfc191bc6163942c8017551ac3f238
gitlab.com
https://gitlab.com/gnutls/gnutls/-/work_items/1642