Apache Tomcat client cert auth bypass 9.x-11.x FFM disabled
CVE-2026-34500 Published on April 9, 2026
Apache Tomcat: OCSP checks sometimes soft-fail with FFM even when soft-fail is disabled
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.
Vulnerability Analysis
CVE-2026-34500 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-34500 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2026-34500
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Affected Versions
Apache Software Foundation Apache Tomcat:- Version 11.0.0-M14, <= 11.0.20 is affected.
- Version 10.1.22, <= 10.1.53 is affected.
- Version 9.0.92, <= 9.0.116 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.