Always-Incorrect Control Flow Implementation in Apache Tomcat - CVE-2026-55276

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Main Vulnerability Database Vulnerabilities #VU135864

Always-Incorrect Control Flow Implementation in Apache Tomcat - CVE-2026-55276

Published: June 30, 2026 / Updated: July 1, 2026


Vulnerability identifier: #VU135864
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55276
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to obtain incomplete security configuration information.

The vulnerability exists due to logic errors in effective web.xml generation in the logged effective web.xml output when generating configuration logs. A local user can review the logged output to obtain incomplete security configuration information.

Special roles and empty authorization constraints are omitted from the logged effective web.xml.


Affected software

Apache Tomcat
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
Web and Scripting Module
openSUSE Leap
Ubuntu
openEuler
tomcat8 (Ubuntu package)
tomcat-jsvc
tomcat
tomcat-help
tomcat-lib
tomcat-admin-webapps
tomcat-javadoc
tomcat-servlet-4_0-api
tomcat-jsp-2_3-api
tomcat-el-3_0-api
tomcat-webapps
tomcat-docs-webapp
tomcat10-servlet-6_0-api
tomcat10
tomcat10-el-5_0-api
tomcat10-jsp-3_1-api
tomcat10-webapps
tomcat10-lib
tomcat10-admin-webapps
tomcat11-doc
tomcat11-embed
tomcat11-docs-webapp
tomcat11-jsvc
tomcat11-webapps
tomcat11-jsp-4_0-api
tomcat11-admin-webapps
tomcat11-lib
tomcat11-servlet-6_1-api
tomcat11-el-6_0-api
tomcat11

How to mitigate CVE-2026-55276

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.119, 10.1.56, 11.0.23
tomcat8 (Ubuntu package) - addressed in versions 8.0.32-1ubuntu1.13+esm2, 8.5.39-1ubuntu1~18.04.3+esm6
tomcat-jsvc - update to 9.0.119-1
tomcat - update to 9.0.119-1
tomcat-help - update to 9.0.119-1
tomcat-lib - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-admin-webapps - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-javadoc - update to 9.0.119-3.169.1
tomcat-servlet-4_0-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-jsp-2_3-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-el-3_0-api - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-webapps - addressed in versions 9.0.119-3.169.1, 9.0.119-150200.111.1
tomcat-docs-webapp - update to 9.0.119-3.169.1
tomcat10-servlet-6_0-api - update to 10.1.56-150200.5.70.1
tomcat10 - update to 10.1.56-150200.5.70.1
tomcat10-el-5_0-api - update to 10.1.56-150200.5.70.1
tomcat10-jsp-3_1-api - update to 10.1.56-150200.5.70.1
tomcat10-webapps - update to 10.1.56-150200.5.70.1
tomcat10-lib - update to 10.1.56-150200.5.70.1
tomcat10-admin-webapps - update to 10.1.56-150200.5.70.1
tomcat11-doc - update to 11.0.23-150600.13.24.1
tomcat11-embed - update to 11.0.23-150600.13.24.1
tomcat11-docs-webapp - update to 11.0.23-150600.13.24.1
tomcat11-jsvc - update to 11.0.23-150600.13.24.1
tomcat11-webapps - update to 11.0.23-150600.13.24.1
tomcat11-jsp-4_0-api - update to 11.0.23-150600.13.24.1
tomcat11-admin-webapps - update to 11.0.23-150600.13.24.1
tomcat11-lib - update to 11.0.23-150600.13.24.1
tomcat11-servlet-6_1-api - update to 11.0.23-150600.13.24.1
tomcat11-el-6_0-api - update to 11.0.23-150600.13.24.1
tomcat11 - update to 11.0.23-150600.13.24.1

External References

Related Security Bulletins