GHSA-5mp6-jrq3-r938
Apache Tomcat: LockOutRealm treats user names as case-sensitive
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.apache.tomcat.embed:tomcat-embed-core | < 9.0.118 | 9.0.118 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 10.1.0-M1, < 10.1.55 | 10.1.55 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 11.0.0-M1, < 11.0.22 | 11.0.22 |
| Maven | org.apache.tomcat:tomcat | < 9.0.118 | 9.0.118 |
| Maven | org.apache.tomcat:tomcat | >= 10.1.0-M1, < 10.1.55 | 10.1.55 |
| Maven | org.apache.tomcat:tomcat | >= 11.0.0-M1, < 11.0.22 | 11.0.22 |
| Maven | org.apache.tomcat:tomcat-catalina | < 9.0.118 | 9.0.118 |
| Maven | org.apache.tomcat:tomcat-catalina | >= 10.1.0-M1, < 10.1.55 | 10.1.55 |
| Maven | org.apache.tomcat:tomcat-catalina | >= 11.0.0-M1, < 11.0.22 | 11.0.22 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-43513
- https://github.com/apache/tomcat/commit/4a90d3fa93988c447cd5bb7482f76ff70d7f15c2
- https://github.com/apache/tomcat/commit/6dd75beb55bd42fc5f78e929596b25018cd17717
- https://github.com/apache/tomcat/commit/83f3e51df7b87f5f6e626951c575ded1a512e8ef
- https://github.com/apache/tomcat
- https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp
- https://tomcat.apache.org/security-10.html
- https://tomcat.apache.org/security-11.html
- https://tomcat.apache.org/security-9.html
- http://www.openwall.com/lists/oss-security/2026/05/12/9