What is CVE-2026-53434?

CVE-2026-53434 is a critical-severity vulnerability in Apache Tomcat, classified under CWE-390. CVSS score: 9.1/10. Published 2026-06-29.

How severe is CVE-2026-53434?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Apache Tomcat

CVE-2026-53434

Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM based connector. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M7 through 10.1.55, from 9.0.83 through 9.0.118. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fixes the issue.

EPSS: 0.005 (41.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Apache Tomcat
Apache Software Foundation Tomcat — versions 11.0.0-M1, 10.1.0-M7, 9.0.83

Weakness classification (CWE)

CWE-390

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-53434?: CVE-2026-53434 is a critical-severity vulnerability in Apache Tomcat, classified under CWE-390. CVSS score: 9.1/10. Published 2026-06-29.
How severe is CVE-2026-53434?: Critical severity. CVSS v3 base score is 9.1 out of 10.