CVE-2026-67693 GnuTLS - Information Disclosure

GnuTLS 3.8.13 contains an information disclosure vulnerability caused by failure to reject end-entity X.509 certificates with contradictory Key Usage and Extended Key Usage, letting attackers obtain sensitive information, exploit requires crafted certificates.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.19% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-367

Vendor fix

Update to the latest version of GnuTLS.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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