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Vulnerabilities

Vulnerability · CVE-2026-95184

Improper certificate validation in gnutls v3.8.13 causes the application to reject legitimate certificates for valid users, leading to a Denial of Service (DoS).

Published Oct 8, 2026 · catalog updated Oct 22, 2026 · Improper certificate validation in

Check if you run it

No confirmed exploitation is on record for CVE-2026-95184. EPSS is 0.17%. Act only if a listed version of Improper certificate validation in is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Improper certificate validation in).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.17%
Remediation
Advisory link
Affected products
Ubuntu:22.04:LTS gnutls28 · Ubuntu:24.04:LTS gnutls28 · Ubuntu:26.04:LTS gnutls28 · Ubuntu:26.10 gnutls28 · Ubuntu:Pro:14.04:LTS gnutls26 · Ubuntu:Pro:16.04:LTS gnutls28

Improper certificate validation in gnutls v3.8.13 causes the application to reject legitimate certificates for valid users, leading to a Denial of Service (DoS).

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Ubuntu:22.04:LTS gnutls283.7.1-5ubuntu1, 3.7.2-2ubuntu1, 3.7.2-4ubuntu1
  • Ubuntu:24.04:LTS gnutls283.8.1-4ubuntu1, 3.8.1-4ubuntu6, 3.8.1-4ubuntu7
  • Ubuntu:26.04:LTS gnutls283.8.9-3ubuntu2, 3.8.10-3ubuntu1, 3.8.12-2ubuntu1
  • Ubuntu:26.10 gnutls283.8.12-2ubuntu1, 3.8.12-2ubuntu1.1, 3.8.13-1ubuntu1
  • Ubuntu:Pro:14.04:LTS gnutls262.12.23-1ubuntu4, 2.12.23-1ubuntu5, 2.12.23-12ubuntu1
  • Ubuntu:Pro:16.04:LTS gnutls283.3.15-5ubuntu2, 3.3.18-1ubuntu1, 3.3.20-1ubuntu1
  • Ubuntu:Pro:18.04:LTS gnutls283.5.8-6ubuntu3, 3.5.17-1ubuntu1, 3.5.17-1ubuntu3
  • Ubuntu:Pro:20.04:LTS gnutls283.6.9-5ubuntu1, 3.6.9-5ubuntu2, 3.6.10-5
  • Ubuntu:Pro:FIPS-preview:22.04:LTS gnutls283.7.3-4ubuntu1.2+Fips1.1
  • Ubuntu:Pro:FIPS-updates:22.04:LTS gnutls283.7.3-4ubuntu1.2+Fips1.1, 3.7.3-4ubuntu1.3+Fips1.1, 3.7.3-4ubuntu1.4+Fips1
  • Ubuntu:Pro:FIPS-updates:24.04:LTS gnutls283.8.3-1.1ubuntu3.1+Fips1, 3.8.3-1.1ubuntu3.4+Fips1, 3.8.3-1.1ubuntu3.4+Fips1.1

How to fix CVE-2026-95184

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-95184. EPSS is 0.17%. Act only if a listed version of Improper certificate validation in is installed.

Which versions are affected?

Compare what you have installed with 3.7.1-5ubuntu1, 3.7.2-2ubuntu1, 3.7.2-4ubuntu1, 3.8.1-4ubuntu1, 3.8.1-4ubuntu6, 3.8.1-4ubuntu7, 3.8.9-3ubuntu2, 3.8.10-3ubuntu1, 3.8.12-2ubuntu1, 3.8.12-2ubuntu1, 3.8.12-2ubuntu1.1, 3.8.13-1ubuntu1, 2.12.23-1ubuntu4, 2.12.23-1ubuntu5, 2.12.23-12ubuntu1, 3.3.15-5ubuntu2, 3.3.18-1ubuntu1, 3.3.20-1ubuntu1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.17%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 8, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    Improper certificate validation in gnutls v3.8.13 causes the application to reject legitimate certificates for valid users, leading to a Denial of Service (DoS).

  2. Oct 22, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    Improper certificate validation in gnutls v3.8.13 causes the application to reject legitimate certificates for valid users, leading to a Denial of Service (DoS).

Sources

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.