Protection Mechanism Failure in Apache Tomcat - CVE-2026-34486

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Main Vulnerability Database Vulnerabilities #VU125746

Protection Mechanism Failure in Apache Tomcat - CVE-2026-34486

Published: April 9, 2026 / Updated: August 4, 2026


Vulnerability identifier: #VU125746
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-2026-34486
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability: The vulnerability is being exploited in the wild

Vulnerability details

The vulnerability allows a remote attacker to bypass the EncryptInterceptor.

The vulnerability exists due to an implementation error in the EncryptInterceptor when processing traffic protected by the fix for #VU125739 (CVE-2026-29146). A remote attacker can exploit the flawed handling to bypass the EncryptInterceptor.


Affected software

Apache Tomcat
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
Anolis OS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Web and Scripting Module
openSUSE Leap
openEuler
IBM Watson Discovery for IBM Cloud Pak for Data
Jira Software Data Center
Jira Service Management Data Center
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
tomcat (Red Hat package)
tomcat-webapps
tomcat-servlet-4.0-api
tomcat-lib
tomcat-jsp-2.3-api
tomcat-el-3.0-api
tomcat-docs-webapp
tomcat-admin-webapps
tomcat
tomcat-help
tomcat-jsvc
tomcat-doc
tomcat-servlet-4_0-api
tomcat-jsp-2_3-api
tomcat-el-3_0-api
tomcat-javadoc
tomcat10-el-5_0-api
tomcat10
tomcat10-jsp-3_1-api
tomcat10-admin-webapps
tomcat10-lib
tomcat10-servlet-6_0-api
tomcat10-webapps
tomcat11-webapps
tomcat11-jsp-4_0-api
tomcat11-embed
tomcat11-jsvc
tomcat11-servlet-6_1-api
tomcat11-el-6_0-api
tomcat11-admin-webapps
tomcat11-docs-webapp
tomcat11
tomcat11-doc
tomcat11-lib

How to mitigate CVE-2026-34486

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.117, 10.1.54, 11.0.21
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2
Jira Software Data Center - update to 11.3.5
Jira Service Management Data Center - update to 11.3.5
tomcat (Red Hat package) - addressed in versions 7.0.76-18.el7_9, 9.0.87-2.el8_8, 9.0.87-2.el9_2, 9.0.87-2.el9_4, 9.0.87-4.el9_6, 9.0.117-2.el9_8
tomcat-webapps - addressed in versions 9.0.87-2, 9.0.117-1
tomcat-servlet-4.0-api - addressed in versions 9.0.87-2, 9.0.117-1
tomcat-lib - addressed in versions 9.0.87-2, 9.0.117-1
tomcat-jsp-2.3-api - addressed in versions 9.0.87-2, 9.0.117-1
tomcat-el-3.0-api - addressed in versions 9.0.87-2, 9.0.117-1
tomcat-docs-webapp - addressed in versions 9.0.87-2, 9.0.117-1
tomcat-admin-webapps - addressed in versions 9.0.87-2, 9.0.117-1
tomcat - addressed in versions 9.0.87-2, 9.0.117-1
tomcat-help - update to 9.0.117-1
tomcat - update to 9.0.117-1
tomcat-jsvc - update to 9.0.117-1
tomcat-doc - update to 9.0.117-1
tomcat-servlet-4_0-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-webapps - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-admin-webapps - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-jsp-2_3-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-lib - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-docs-webapp - update to 9.0.117-3.163.2
tomcat-el-3_0-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-javadoc - update to 9.0.117-3.163.2
tomcat10-el-5_0-api - update to 10.1.54-150200.5.64.1
tomcat10 - update to 10.1.54-150200.5.64.1
tomcat10-jsp-3_1-api - update to 10.1.54-150200.5.64.1
tomcat10-admin-webapps - update to 10.1.54-150200.5.64.1
tomcat10-lib - update to 10.1.54-150200.5.64.1
tomcat10-servlet-6_0-api - update to 10.1.54-150200.5.64.1
tomcat10-webapps - update to 10.1.54-150200.5.64.1
tomcat11-webapps - update to 11.0.21-150600.13.18.1
tomcat11-jsp-4_0-api - update to 11.0.21-150600.13.18.1
tomcat11-embed - update to 11.0.21-150600.13.18.1
tomcat11-jsvc - update to 11.0.21-150600.13.18.1
tomcat11-servlet-6_1-api - update to 11.0.21-150600.13.18.1
tomcat11-el-6_0-api - update to 11.0.21-150600.13.18.1
tomcat11-admin-webapps - update to 11.0.21-150600.13.18.1
tomcat11-docs-webapp - update to 11.0.21-150600.13.18.1
tomcat11 - update to 11.0.21-150600.13.18.1
tomcat11-doc - update to 11.0.21-150600.13.18.1
tomcat11-lib - update to 11.0.21-150600.13.18.1

External References

Related Security Bulletins