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Apache Tomcat's LockOutRealm component improperly handles case sensitivity in user names, allowing remote attackers to potentially bypass account lockout protections and obtain sensitive information. This vulnerability affects multiple versions of Apache Tomcat, including 11.0.0 through 11.0.21, 10.1.0 through 10.1.54, 9.0.0 through 9.0.117, 8.5.0 through 8.5.100, and 7.0.0 through 7.0.109. Official patches are available in versions 11.0.22, 10.1.55, and 9.0.118. Users are advised to update to these fixed versions and restart Tomcat to apply the changes.

CVE-2026-43513 describes a vulnerability in Apache Tomcat's LockOutRealm where user names are treated as case-sensitive incorrectly. This improper handling of case sensitivity can be exploited by remote attackers to bypass account lockout protections and potentially access sensitive information. The issue affects a wide range of Apache Tomcat versions from 7.0.0 up to 11.0.21. The vulnerability has been addressed in Apache Tomcat releases 11.0.22, 10.1.55, and 9.0.118. Ubuntu security advisories confirm the existence of this vulnerability and provide fixed package versions. After applying updates, a Tomcat service restart is required to complete remediation.

Detailed information about UBUNTU-CVE-2026-43513 affecting null tomcat6. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-43513 - Live Threat Intelligence - Threat Radar | OffSeq.com

https://access.redhat.com/errata/RHSA-2026:44426

https://images.redhat.com/

https://access.redhat.com/security/cve/CVE-2026-43513

https://access.redhat.com/security/updates/classification/

Canonical URL

https://access.redhat.com/errata/RHSA-2026:44427

Apache Tomcat: LockOutRealm treats user names as case-sensitive (CVE-2026-43513)

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