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Vulnerability · Published Oct 8, 2026 · Assigned by mitre

CVE-2026-67693

Low 3.7

In plain English

A low-severity security flaw in the gnutls28 package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).

Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.2%top 94.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12gnutls28no fix listedDEBIAN-CVE-2026-67693
Debian:13gnutls28no fix listedDEBIAN-CVE-2026-67693
Debian:14gnutls28no fix listedDEBIAN-CVE-2026-67693
Ubuntu:22.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-67693
Ubuntu:24.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-67693
Ubuntu:26.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-67693
Ubuntu:26.10gnutls28no fix listedUBUNTU-CVE-2026-67693

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References