CVE-2026-95210

medium

Improper certificate validation in gnutls v3.8.13 causes the application to accept certificates containing invalid extensions.

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.

CVSS

4.8

4.8 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

Timeline (UTC)

Published: 2026-10-08 18:18

Modified: 2026-11-04 05:19

NVD status: Awaiting Analysis

Last synced 21 hours ago

Verified against the source API 2026-11-04 05:28 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

Not reported by the source (unknown — not "none").

Weakness classification (CWE)

CWE-295

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

No vendor advisory or patch reference tagged by NVD. Check the references below.

References

http://gnutls.com cve@mitre.org
https://gist.github.com/lkloliver/4aad23689202720c4068f43b3c6069c7 cve@mitre.org
https://gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.... cve@mitre.org
https://gitlab.com/gnutls/gnutls/-/work_items/1965 cve@mitre.org
https://github.com/lkloliver/poc/tree/main/CVE-2026-95210 af854a3a-2127-422b-91ae-364da2661108

Data sources

NVD CVE API 2.0 — fetched 2026-11-04 05:28 UTC · record ↗

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