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Apache Tomcat: CLIENT_CERT authentication does not fail as expected

Moderate severity GitHub Reviewed Published Apr 9, 2026 to the GitHub Advisory Database • Updated Apr 10, 2026

Package

maven org.apache.tomcat.embed:tomcat-embed-core (Maven)

Affected versions

>= 9.0.92, < 9.0.117
>= 10.1.22, < 10.1.54
>= 11.0.0-M14, < 11.0.21

Patched versions

9.0.117
10.1.54
11.0.21
maven org.apache.tomcat:tomcat (Maven)
>= 9.0.92, < 9.0.117
>= 10.1.22, < 10.1.54
>= 11.0.0-M14, < 11.0.21
9.0.117
10.1.54
11.0.21
maven org.apache.tomcat:tomcat-catalina (Maven)
>= 9.0.92, < 9.0.117
>= 10.1.22, < 10.1.54
>= 11.0.0-M14, < 11.0.21
9.0.117
10.1.54
11.0.21

Description

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes the issue.

References

Published by the National Vulnerability Database Apr 9, 2026
Published to the GitHub Advisory Database Apr 9, 2026
Reviewed Apr 10, 2026
Last updated Apr 10, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(36th percentile)

Weaknesses

Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Learn more on MITRE.

CVE ID

CVE-2026-34500

GHSA ID

GHSA-24j9-x2wg-9qv6

Source code

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