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

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Apache Software Foundation / Apache Tomcat	affected 11.0.0-M1 through 11.0.21; affected 10.1.0-M1 through 10.1.54; affected 9.0.0.M1 through 9.0.117; affected 8.5.0 through 8.5.100; affected 7.0.0 through 7.0.109; unknown 0 before 7.00

CWE

CWE-178

References

https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/05/12/9

CISA-ADP

No English description supplied.

No references supplied.