Apache Tomcat: LockOutRealm treats user names as case-sensitive

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Summary

CVECVE-2026-43513
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-12 16:16:18 UTC
Updated2026-05-12 16:37:05 UTC
DescriptionImproper 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.

Risk And Classification

Problem Types: CWE-178 | CWE-178 CWE-178 Improper Handling of Case Sensitivity

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Tomcat affected 11.0.0-M1 11.0.21 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 10.1.0-M1 10.1.54 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 9.0.0.M1 9.0.117 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 8.5.0 8.5.100 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 7.0.0 7.0.109 semver Not specified
CNA Apache Software Foundation Apache Tomcat unknown 7.00 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp [email protected] lists.apache.org
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