Bug 2476520 (CVE-2026-43513)

Summary: CVE-2026-43513 tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: csutherl, dsoumis, jclere, jwon, pjindal, plodge, rhel-process-autobot, rmaucher, szappis, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
In Apache Tomcat, LockOutRealm mishandled case sensitivity in usernames, resulting in less effective blocking of brute force attacks.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2514402    
Bug Blocks:    

Description OSIDB Bzimport 2026-05-12 16:02:11 UTC
Improper Handling of Case Sensitivity vulnerability in LockOutRealm in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.
Older unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Comment 7 errata-xmlrpc 2026-07-14 16:08:53 UTC
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0.0

Via RHSA-2026:39189 https://access.redhat.com/errata/RHSA-2026:39189

Comment 8 errata-xmlrpc 2026-07-14 16:11:49 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-2026:39188 https://access.redhat.com/errata/RHSA-2026:39188

Comment 9 errata-xmlrpc 2026-07-22 12:22:39 UTC
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2.4

Via RHSA-2026:43402 https://access.redhat.com/errata/RHSA-2026:43402

Comment 10 errata-xmlrpc 2026-07-22 12:23:51 UTC
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2 on RHEL 10
  Red Hat JBoss Web Server 6.2 on RHEL 8
  Red Hat JBoss Web Server 6.2 on RHEL 9

Via RHSA-2026:43401 https://access.redhat.com/errata/RHSA-2026:43401

Comment 12 Jon Orris 2026-09-14 13:35:04 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:67164 https://access.redhat.com/errata/RHSA-2026:67164

Comment 13 Jon Orris 2026-09-14 13:35:22 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:67163 https://access.redhat.com/errata/RHSA-2026:67163

Comment 14 Jon Orris 2026-09-17 14:21:24 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:68659 https://access.redhat.com/errata/RHSA-2026:68659

Comment 15 Jon Orris 2026-09-17 14:33:05 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:68678 https://access.redhat.com/errata/RHSA-2026:68678

Comment 16 Jon Orris 2026-09-17 14:36:21 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:68679 https://access.redhat.com/errata/RHSA-2026:68679

Comment 17 Jon Orris 2026-09-17 14:39:10 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:68680 https://access.redhat.com/errata/RHSA-2026:68680

Comment 18 Jon Orris 2026-09-17 14:40:21 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:68660 https://access.redhat.com/errata/RHSA-2026:68660

Comment 19 Jon Orris 2026-09-17 15:03:15 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:68677 https://access.redhat.com/errata/RHSA-2026:68677

Comment 20 Jon Orris 2026-09-18 09:04:57 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:68651 https://access.redhat.com/errata/RHSA-2026:68651