Bug 2499917 (CVE-2026-59083) - CVE-2026-59083 tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve
Summary: CVE-2026-59083 tomcat: Apache Tomcat: Security constraint bypass via improper...
Keywords:
Status: NEW
Alias: CVE-2026-59083
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2508527
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-14 09:01 UTC by OSIDB Bzimport
Modified: 2026-08-05 13:12 UTC (History)
10 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:49951 0 None None None 2026-08-05 13:12:35 UTC
Red Hat Product Errata RHSA-2026:49952 0 None None None 2026-08-05 13:11:46 UTC

Description OSIDB Bzimport 2026-07-14 09:01:28 UTC 
Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.

Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.
Comment 3 errata-xmlrpc 2026-08-05 13:11:45 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0.1

Via RHSA-2026:49952 https://access.redhat.com/errata/RHSA-2026:49952
Comment 4 errata-xmlrpc 2026-08-05 13:12:34 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0 on RHEL 10
  Red Hat JBoss Web Server 7.0 on RHEL 8
  Red Hat JBoss Web Server 7.0 on RHEL 9

Via RHSA-2026:49951 https://access.redhat.com/errata/RHSA-2026:49951
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