Vulnerability · Published Apr 9, 2026 · Assigned by apache
CVE-2026-34487Apache Tomcat: Cloud membership for clustering component exposed the Kubernetes bearer token
High 7.5
In plain English
A high-severity sensitive data in logs in Apache Tomcat from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 60.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | tomcat | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-admin-webapps | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-admin-webapps | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-docs-webapp | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-docs-webapp | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-el-3.0-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-el-3.0-api | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-jsp-2.3-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-jsp-2.3-api | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-lib | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-lib | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-servlet-4.0-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-servlet-4.0-api | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-webapps | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-webapps | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:10 | tomcat9 | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9 | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-admin-webapps | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-admin-webapps | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-docs-webapp | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-docs-webapp | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-el-3.0-api | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-el-3.0-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-jsp-2.3-api | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-jsp-2.3-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-lib | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-lib | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-servlet-4.0-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-servlet-4.0-api | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-webapps | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-webapps | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| Debian:12 | tomcat10 | 10.1.55-1~deb12u1 | DEBIAN-CVE-2026-34487 |
| Debian:13 | tomcat10 | 10.1.55-1~deb13u1 | DEBIAN-CVE-2026-34487 |
| Debian:14 | tomcat10 | 10.1.54-1 | DEBIAN-CVE-2026-34487 |
| Debian:13 | tomcat11 | 11.0.22-1~deb13u1 | DEBIAN-CVE-2026-34487 |
| Debian:14 | tomcat11 | 11.0.21-1 | DEBIAN-CVE-2026-34487 |
| Debian:12 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-34487 |
| Debian:13 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-34487 |
| Debian:14 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-34487 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 10.1.54 | GHSA-x4m4-345f-5h5g |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 11.0.21 | GHSA-x4m4-345f-5h5g |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 9.0.117 | GHSA-x4m4-345f-5h5g |
| Maven | org.apache.tomcat:tomcat | 9.0.117 | GHSA-x4m4-345f-5h5g |
| Maven | org.apache.tomcat:tomcat | 10.1.54 | GHSA-x4m4-345f-5h5g |
| Maven | org.apache.tomcat:tomcat | 11.0.21 | GHSA-x4m4-345f-5h5g |
| Maven | org.apache.tomcat:tomcat-tribes | 11.0.21 | GHSA-x4m4-345f-5h5g |
| Maven | org.apache.tomcat:tomcat-tribes | 10.1.54 | GHSA-x4m4-345f-5h5g |
| Maven | org.apache.tomcat:tomcat-tribes | 9.0.117 | GHSA-x4m4-345f-5h5g |
| Rocky Linux:10 | tomcat9 | 1:9.0.117-1.el10_2 | RLSA-2026:25341 |
| Ubuntu:24.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-34487 |
| Ubuntu:25.10 | tomcat10 | no fix listed | UBUNTU-CVE-2026-34487 |
| Ubuntu:26.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-34487 |
| Ubuntu:25.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-34487 |
| Ubuntu:26.04:LTS | tomcat11 | no fix listed | UBUNTU-CVE-2026-34487 |
| Ubuntu:24.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-34487 |
| Ubuntu:25.10 | tomcat9 | no fix listed | UBUNTU-CVE-2026-34487 |
| Ubuntu:26.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-34487 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – through 11.0.2010.1.0-M1 – through 10.1.539.0.13 – through 9.0.116 |
Weakness: CWE-532 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N