CVE-2026-67693

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-67693
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 19:18:41 UTC
Updated2026-11-04 05:19:00 UTC
DescriptionGnuTLS 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.

Risk And Classification

Primary CVSS: v3.1 3.7 LOW from ADP

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.001670000 probability, percentile 0.059840000 (date 2026-11-04)

Problem Types: CWE-367 | n/a | CWE-367 CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
gitlab.com/gnutls/gnutls/-/work_items/1965 [email protected] gitlab.com
gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f... [email protected] gitlab.com
github.com/lkloliver/poc/tree/main/CVE-2026-67693 af854a3a-2127-422b-91ae-364da2661108 github.com
gist.github.com/lkloliver/6fbfc191bc6163942c8017551ac3f238 [email protected] gist.github.com
gitlab.com/gnutls/gnutls/-/blob/3.8.13/lib/x509/verify.c [email protected] gitlab.com
gitlab.com/gnutls/gnutls/-/work_items/1642 [email protected] gitlab.com
gnutls.com MITRE gnutls.com
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