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Vulnerability · Published Oct 8, 2026 · Assigned by mitre

CVE-2026-95210

Medium 4.8

In plain English

A medium-severity improper certificate validation 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 10% of all known vulnerabilities).

Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.2%top 90.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. 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-2026-95210
Debian:13gnutls28no fix listedDEBIAN-CVE-2026-95210
Debian:14gnutls28no fix listedDEBIAN-CVE-2026-95210
Ubuntu:22.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-95210
Ubuntu:24.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-95210
Ubuntu:26.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-95210
Ubuntu:26.10gnutls28no fix listedUBUNTU-CVE-2026-95210

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References