Incorrect Behavior Order: Validate Before Canonicalize in Apache Tomcat - CVE-2026-59083

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Main Vulnerability Database Vulnerabilities #VU137408

Incorrect Behavior Order: Validate Before Canonicalize in Apache Tomcat - CVE-2026-59083

Published: July 14, 2026


Vulnerability identifier: #VU137408
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59083
CWE-ID: CWE-180
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass security controls.

The vulnerability exists due to incorrect URL decoding in RewriteValve when processing rewritten URIs. A remote attacker can send a specially crafted request to bypass security controls.

Only some configurations are vulnerable.


Affected software

Apache Tomcat
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
Web and Scripting Module
openSUSE Leap
openEuler
Integration Bus for z/OS
tomcat-help
tomcat-jsvc
tomcat
tomcat-docs-webapp
tomcat-webapps
tomcat-lib
tomcat-servlet-4_0-api
tomcat-el-3_0-api
tomcat-jsp-2_3-api
tomcat-javadoc
tomcat-admin-webapps
tomcat10-jsp-3_1-api
tomcat10-admin-webapps
tomcat10-webapps
tomcat10-el-5_0-api
tomcat10-lib
tomcat10
tomcat10-servlet-6_0-api
tomcat11-doc
tomcat11-docs-webapp
tomcat11-jsvc
tomcat11-embed
tomcat11-lib
tomcat11-admin-webapps
tomcat11-servlet-6_1-api
tomcat11-jsp-4_0-api
tomcat11-webapps
tomcat11-el-6_0-api
tomcat11

How to mitigate CVE-2026-59083

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.120, 10.1.57, 11.0.24
Integration Bus for z/OS - update to 10.1.0.7 PH72347
tomcat-help - update to 9.0.120-1
tomcat-jsvc - update to 9.0.120-1
tomcat - update to 9.0.120-1
tomcat-docs-webapp - update to 9.0.120-3.174.1
tomcat-webapps - addressed in versions 9.0.120-3.174.1, 9.0.120-150200.114.1
tomcat-lib - addressed in versions 9.0.120-3.174.1, 9.0.120-150200.114.1
tomcat-servlet-4_0-api - addressed in versions 9.0.120-3.174.1, 9.0.120-150200.114.1
tomcat-el-3_0-api - addressed in versions 9.0.120-3.174.1, 9.0.120-150200.114.1
tomcat-jsp-2_3-api - addressed in versions 9.0.120-3.174.1, 9.0.120-150200.114.1
tomcat-javadoc - update to 9.0.120-3.174.1
tomcat-admin-webapps - addressed in versions 9.0.120-3.174.1, 9.0.120-150200.114.1
tomcat - addressed in versions 9.0.120-3.174.1, 9.0.120-150200.114.1
tomcat10-jsp-3_1-api - update to 10.1.57-150200.5.73.1
tomcat10-admin-webapps - update to 10.1.57-150200.5.73.1
tomcat10-webapps - update to 10.1.57-150200.5.73.1
tomcat10-el-5_0-api - update to 10.1.57-150200.5.73.1
tomcat10-lib - update to 10.1.57-150200.5.73.1
tomcat10 - update to 10.1.57-150200.5.73.1
tomcat10-servlet-6_0-api - update to 10.1.57-150200.5.73.1
tomcat11-doc - update to 11.0.24-150600.13.27.1
tomcat11-docs-webapp - update to 11.0.24-150600.13.27.1
tomcat11-jsvc - update to 11.0.24-150600.13.27.1
tomcat11-embed - update to 11.0.24-150600.13.27.1
tomcat11-lib - update to 11.0.24-150600.13.27.1
tomcat11-admin-webapps - update to 11.0.24-150600.13.27.1
tomcat11-servlet-6_1-api - update to 11.0.24-150600.13.27.1
tomcat11-jsp-4_0-api - update to 11.0.24-150600.13.27.1
tomcat11-webapps - update to 11.0.24-150600.13.27.1
tomcat11-el-6_0-api - update to 11.0.24-150600.13.27.1
tomcat11 - update to 11.0.24-150600.13.27.1

External References

Related Security Bulletins