Improper access control in Apache Tomcat - CVE-2026-43515

Vulnerability identifier: #VU131177

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-43515

CWE-ID: CWE-284

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to bypass security constraints.

The vulnerability exists due to improper access control in HTTP method constraint processing when evaluating multiple security constraints for the same extension pattern. A remote attacker can send a request using an improperly constrained HTTP method to bypass security constraints.

Apache Tomcat
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP4
Debian Linux
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
Ubuntu
Web and Scripting Module
openSUSE Leap
openEuler
Storage Defender Copy Data Management
Maximo Application Suite Ai Service
CICS Transaction Gateway Desktop Edition
CICS Transaction Gateway for Multiplatforms
ApplinX
Dell Wyse Management Suite
IBM Watson Speech Services Cartridge for IBM Cloud Pak for Data
IBM Watson Discovery for IBM Cloud Pak for Data
Jira Service Management Data Center
Confluence Data Center
Jira Software Data Center
SAP Commerce Cloud
tomcat6 (Ubuntu package)
tomcat8 (Ubuntu package)
tomcat10 (Ubuntu package)
tomcat-help
tomcat
tomcat-jsvc
tomcat-webapps
tomcat-jsp-2_3-api
tomcat-el-3_0-api
tomcat-javadoc
tomcat-lib
tomcat-admin-webapps
tomcat-servlet-4_0-api
tomcat-docs-webapp
tomcat10 (Debian package)
tomcat10-servlet-6_0-api
tomcat10-lib
tomcat10-admin-webapps
tomcat10
tomcat10-webapps
tomcat10-el-5_0-api
tomcat10-jsp-3_1-api
tomcat11 (Ubuntu package)
tomcat11 (Debian package)
tomcat11
tomcat11-el-6_0-api
tomcat11-admin-webapps
tomcat11-servlet-6_1-api
tomcat11-doc
tomcat11-jsvc
tomcat11-docs-webapp
tomcat11-webapps
tomcat11-lib
tomcat11-jsp-4_0-api
tomcat11-embed

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.118, 10.1.55, 11.0.22
Storage Defender Copy Data Management - update to 2.3.1.0
IBM Watson Speech Services Cartridge for IBM Cloud Pak for Data - update to 5.4.0 Patch 3
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2
Jira Service Management Data Center - addressed in versions 10.3.22, 11.3.7
Confluence Data Center - addressed in versions 9.2.21, 10.2.13
Maximo Application Suite Ai Service - update to 9.1.16
Jira Software Data Center - addressed in versions 9.12.36, 10.3.22, 11.3.7
tomcat6 (Ubuntu package) - addressed in versions 6.0.39-1ubuntu0.1+esm3, 7.0.52-1ubuntu0.16+esm2, 7.0.68-1ubuntu0.4+esm4
tomcat8 (Ubuntu package) - addressed in versions 8.0.32-1ubuntu1.13+esm2, 8.5.39-1ubuntu1~18.04.3+esm6
tomcat10 (Ubuntu package) - addressed in versions 9.0.16-3ubuntu0.18.04.2+esm8, 9.0.31-1ubuntu0.9+esm3, 9.0.58-1ubuntu0.2+esm4, 9.0.70-2ubuntu0.1+esm3, 9.0.95-1ubuntu1.1, 9.0.115-1ubuntu0.1, 10.1.16-1ubuntu0.1~esm4, 10.1.40-1ubuntu1.25.10.1, 10.1.40-1ubuntu1.26.04.1
tomcat-help - update to 9.0.118-1
tomcat - update to 9.0.118-1
tomcat-jsvc - update to 9.0.118-1
tomcat-webapps - addressed in versions 9.0.118-3.166.1, 9.0.118-150200.108.1
tomcat-jsp-2_3-api - addressed in versions 9.0.118-3.166.1, 9.0.118-150200.108.1
tomcat-el-3_0-api - addressed in versions 9.0.118-3.166.1, 9.0.118-150200.108.1
tomcat-javadoc - update to 9.0.118-3.166.1
tomcat - addressed in versions 9.0.118-3.166.1, 9.0.118-150200.108.1
tomcat-lib - addressed in versions 9.0.118-3.166.1, 9.0.118-150200.108.1
tomcat-admin-webapps - addressed in versions 9.0.118-3.166.1, 9.0.118-150200.108.1
tomcat-servlet-4_0-api - addressed in versions 9.0.118-3.166.1, 9.0.118-150200.108.1
tomcat-docs-webapp - update to 9.0.118-3.166.1
tomcat10 (Debian package) - addressed in versions 10.1.55-1~deb12u1, 10.1.55-1~deb13u1
tomcat10-servlet-6_0-api - update to 10.1.55-150200.5.67.1
tomcat10-lib - update to 10.1.55-150200.5.67.1
tomcat10-admin-webapps - update to 10.1.55-150200.5.67.1
tomcat10 - update to 10.1.55-150200.5.67.1
tomcat10-webapps - update to 10.1.55-150200.5.67.1
tomcat10-el-5_0-api - update to 10.1.55-150200.5.67.1
tomcat10-jsp-3_1-api - update to 10.1.55-150200.5.67.1
tomcat11 (Ubuntu package) - update to 11.0.18-1ubuntu0.1~esm1
tomcat11 (Debian package) - update to 11.0.22-1~deb13u1
tomcat11 - update to 11.0.22-150600.13.21.1
tomcat11-el-6_0-api - update to 11.0.22-150600.13.21.1
tomcat11-admin-webapps - update to 11.0.22-150600.13.21.1
tomcat11-servlet-6_1-api - update to 11.0.22-150600.13.21.1
tomcat11-doc - update to 11.0.22-150600.13.21.1
tomcat11-jsvc - update to 11.0.22-150600.13.21.1
tomcat11-docs-webapp - update to 11.0.22-150600.13.21.1
tomcat11-webapps - update to 11.0.22-150600.13.21.1
tomcat11-lib - update to 11.0.22-150600.13.21.1
tomcat11-jsp-4_0-api - update to 11.0.22-150600.13.21.1
tomcat11-embed - update to 11.0.22-150600.13.21.1
Dell Wyse Management Suite - update to 2605 HF1

• Exploit #12773 - cve-2026-43515-poc (Exploitability PoC for CVE-2026-43515 (Apache Tomcat constraint bypass).) (June 23, 2026)

• https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.22
• https://github.com/apache/tomcat/commit/276087d9c7abbcecc6c4fb4e4b08cf64780c6e36

• Multiple vulnerabilities in Apache Tomcat
• openEuler update for tomcat
• Ubuntu update for tomcat6
• Debian update for tomcat11
• Debian update for tomcat10
• SUSE update for tomcat
• Ubuntu update for tomcat10
• SUSE update for tomcat11
• SUSE update for tomcat10
• Multiple vulnerabilities in IBM ApplinX
• Multiple vulnerabilities in IBM Watson Discovery Cartridge
• Ubuntu update for tomcat11
• Multiple vulnerabilities in Confluence Data Center
• Multiple vulnerabilities in Jira Service Management Data Center and Jira Service Management Server
• Multiple vulnerabilities in Jira Software Data Center
• Multiple vulnerabilities in IBM Storage Defender Copy Data Management
• SUSE update for tomcat
• Multiple vulnerabilities in IBM Maximo AI Service
• SAP Commerce Cloud update for Apache Tomcat
• Multiple vulnerabilities in IBM CICS Transaction Gateway for Multiplatforms
• Multiple vulnerabilities in CICS Transaction Gateway Desktop Edition
• Ubuntu update for tomcat8
• Multiple vulnerabilities in IBM Watson Speech Services Cartridge
• Multiple vulnerabilities in Dell Wyse Management Suite (WMS)