CVE-2026-43513 PUBLISHED

Apache Tomcat: LockOutRealm treats user names as case-sensitive

Assigner: apache
Reserved: 01.05.2026 Published: 12.05.2026 Updated: 12.05.2026

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.

Product Status

Vendor Apache Software Foundation
Product Apache Tomcat
Versions Default: unaffected
  • affected from 11.0.0-M1 to 11.0.21 (incl.)
  • affected from 10.1.0-M1 to 10.1.54 (incl.)
  • affected from 9.0.0.M1 to 9.0.117 (incl.)
  • affected from 8.5.0 to 8.5.100 (incl.)
  • affected from 7.0.0 to 7.0.109 (incl.)
  • unknown from 0 to 7.00 (excl.)

References

Problem Types

  • CWE-178 Improper Handling of Case Sensitivity CWE