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CVE-2026-43513

HIGH

Apache Tomcat: LockOutRealm treats user names as case-sensitive

Published May 12, 2026Updated May 19, 2026Source: osv

Summary

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.

Remediation

Upgrade to the fixed version using your package manager.

Maven
Update org.apache.tomcat.embed:tomcat-embed-core to 11.0.22 or later
<!-- Update pom.xml dependency version to 11.0.22 for org.apache.tomcat.embed:tomcat-embed-core -->
Maven
Update org.apache.tomcat.embed:tomcat-embed-core to 9.0.118 or later
<!-- Update pom.xml dependency version to 9.0.118 for org.apache.tomcat.embed:tomcat-embed-core -->
Maven
Update org.apache.tomcat.embed:tomcat-embed-core to 10.1.55 or later
<!-- Update pom.xml dependency version to 10.1.55 for org.apache.tomcat.embed:tomcat-embed-core -->
Maven
Update org.apache.tomcat:tomcat-catalina to 9.0.118 or later
<!-- Update pom.xml dependency version to 9.0.118 for org.apache.tomcat:tomcat-catalina -->
Maven
Update org.apache.tomcat:tomcat to 11.0.22 or later
<!-- Update pom.xml dependency version to 11.0.22 for org.apache.tomcat:tomcat -->
Maven
Update org.apache.tomcat:tomcat-catalina to 11.0.22 or later
<!-- Update pom.xml dependency version to 11.0.22 for org.apache.tomcat:tomcat-catalina -->
Maven
Update org.apache.tomcat:tomcat to 10.1.55 or later
<!-- Update pom.xml dependency version to 10.1.55 for org.apache.tomcat:tomcat -->
Maven
Update org.apache.tomcat:tomcat to 9.0.118 or later
<!-- Update pom.xml dependency version to 9.0.118 for org.apache.tomcat:tomcat -->
Maven
Update org.apache.tomcat:tomcat-catalina to 10.1.55 or later
<!-- Update pom.xml dependency version to 10.1.55 for org.apache.tomcat:tomcat-catalina -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (9)

PackageEcosystemAffectedFixed In
org.apache.tomcat.embed:tomcat-embed-core
maven
11.0.0, 11.0.0-M1, 11.0.0-M10, 11.0.0-M11 (+38 more)11.0.22
org.apache.tomcat.embed:tomcat-embed-core
maven
7.0.0, 7.0.100, 7.0.103, 7.0.104 (+318 more)9.0.118
org.apache.tomcat.embed:tomcat-embed-core
maven
10.1.0, 10.1.0-M1, 10.1.0-M10, 10.1.0-M11 (+57 more)10.1.55
org.apache.tomcat:tomcat-catalina
maven
7.0.0, 7.0.100, 7.0.103, 7.0.104 (+318 more)9.0.118
org.apache.tomcat:tomcat
maven
11.0.0, 11.0.0-M1, 11.0.0-M10, 11.0.0-M11 (+38 more)11.0.22
org.apache.tomcat:tomcat-catalina
maven
11.0.0, 11.0.0-M1, 11.0.0-M10, 11.0.0-M11 (+38 more)11.0.22
org.apache.tomcat:tomcat
maven
10.1.0, 10.1.0-M1, 10.1.0-M10, 10.1.0-M11 (+57 more)10.1.55
org.apache.tomcat:tomcat
maven
7.0.100, 7.0.103, 7.0.104, 7.0.105 (+294 more)9.0.118
org.apache.tomcat:tomcat-catalina
maven
10.1.0, 10.1.0-M1, 10.1.0-M10, 10.1.0-M11 (+57 more)10.1.55

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Frequently Asked Questions

What is CVE-2026-43513?
Apache Tomcat: LockOutRealm treats user names as case-sensitive This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-43513?
CVE-2026-43513 affects org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat-catalina and org.apache.tomcat:tomcat. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-43513 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-5mp6-jrq3-r938
BIT-tomcat-2026-43513

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