What is CVE-2026-34487?

CVE-2026-34487 is a high-severity vulnerability in Apache Tomcat, classified under Insertion of Sensitive Information into Log File. CVSS score: 7.5/10. Published 2026-04-09.

How severe is CVE-2026-34487?

High severity. CVSS v3 base score is 7.5 out of 10.

Information disclosure in Apache Tomcat

CVE-2026-34487

Insertion of Sensitive Information into Log File vulnerability in the cloud membership for clustering component of Apache Tomcat exposed the Kubernetes bearer token. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.13 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.

EPSS: 0.004 (36.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Apache Tomcat
Apache Software Foundation Tomcat — versions 11.0.0-M1, 10.1.0-M1, 9.0.13

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

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

Frequently asked questions

What is CVE-2026-34487?: CVE-2026-34487 is a high-severity vulnerability in Apache Tomcat, classified under Insertion of Sensitive Information into Log File. CVSS score: 7.5/10. Published 2026-04-09.
How severe is CVE-2026-34487?: High severity. CVSS v3 base score is 7.5 out of 10.