CVE-2026-34500

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 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.

How to fix CVE-2026-34500

To remediate CVE-2026-34500, upgrade the affected package to a fixed version below.

• —upgrade to 9.0.117 or later
• —upgrade to 10.1.55-1~deb12u1 or later
• —upgrade to 11.0.22-1~deb13u1 or later
• —upgrade to 9.0.118-0+deb11u1 or later
• —upgrade to 9.0.117 or later

Is CVE-2026-34500 being exploited?

Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.

Affected packages (5)

• >= 9.0.92, < 9.0.117, >= 10.1.22, < 10.1.54, >= 11.0.0, < 11.0.21
• from 0, < 10.1.55-1~deb12u1
• from 0, < 11.0.22-1~deb13u1
• from 0, < 9.0.118-0+deb11u1
• >= 9.0.92, < 9.0.117

CVSS scores

References (11)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-34500
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-34500
• PATCHgithub.com/apache/tomcat
• WEBwww.openwall.com/lists/oss-security/2026/04/09/29
• WEB