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TI-2026-69628 Aliases CVE-2026-95210GHSA-9mfx-g534-q3pc

GnuTLS accepts unprocessable critical keyUsage extensions

Priority LOW 21CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-295.

Summary

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, for example when extnValue is an ASN.1 NULL instead of a BIT STRING. This is an improper certificate validation weakness (CWE-295). CVSS rates it Medium, with a remote attacker needing no privileges or user interaction, high attack complexity, and low confidentiality and integrity impact. The supplier does not consider it an actionable security vulnerability because its threat model excludes attacks that require modifying the trust boundary.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.002 9th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for GnuTLS. Red Hat lists Red Hat Hardened Images as affected with no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesAffectedNo fix yet

Timeline

  1. 2026-10-08 Threatist record created from CVE-2026-95210
  2. 2026-10-09 Alias added: GHSA-9mfx-g534-q3pc
  3. 2026-10-19 CVSS score changed · CISA ADP
  4. 2026-10-19 CISA SSVC decision points changed
  5. 2026-10-19 Priority changed: HIGH → LOW
  6. 2026-10-21 Affected versions changed · Red Hat
  7. 2026-11-04 Title updated · CNA
  8. 2026-11-04 2 new references · CNA

References

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences