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CVE-2026-95210

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…

Products / packages n/a

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CVE-2026-95210 · Disputed

The record is disputed. Review the publisher’s explanation and references before drawing a conclusion.

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:40:35 UTC
CISA-ADP · CVSS:3.1 · 4.8
Assessment vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Severity

medium4.8

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

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.

Source excerpt · mitre

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

n/a · mitre

n/a

1 range
mitre version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

n/a

unaffected

unknown

Other versions: unknown

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher 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.

References

5 sources
gnutls.com/
Source referencemitre
gist.github.com/lkloliver/4aad23689202720c4068f43b3c6069c7
Source referencemitre
gitlab.com/gnutls/gnutls/-/work_items/1965
Source referencemitre
gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.md
Security advisorymitre
lkloliver/poc · tree/main/CVE-2026-95210
Security advisoryCVE

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-95210

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-295 ↗

CWE-295 Improper Certificate Validation

CISA-ADP

Related →
Contributing organizations · 3
mitre

Assigning organization

2026-11-04
CISA-ADP

Additional data publisher

2026-10-19
CVE

Additional data publisher

2026-11-04

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-95210

    Observed 2026-11-04T05:01:00.516Z · upstream updated 2026-11-04T04:54:27.527Z

    References changed

    before

    [
  "http://gnutls.com",
  "https://gist.github.com/lkloliver/4aad23689202720c4068f43b3c6069c7",
  "https://gitlab.com/gnutls/gnutls/-/work_items/1965",
  "https://gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.md"
]

    after

    [
  "http://gnutls.com",
  "https://gist.github.com/lkloliver/4aad23689202720c4068f43b3c6069c7",
  "https://gitlab.com/gnutls/gnutls/-/work_items/1965",
  "https://gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.md",
  "https://github.com/lkloliver/poc/tree/main/CVE-2026-95210"
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.