Answer in brief
CVE-2026-43513 records a High severity (CVSS 7.5) vulnerability in Apache Tomcat: LockOutRealm treats user names as case-sensitive. The current sources do not mark it as known exploited. The current feed maps org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat:tomcat (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat:tomcat (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| org.apache.tomcat.embed:tomcat-embed-coremaven | >=0 <9.0.118 | 9.0.118 |
| org.apache.tomcat.embed:tomcat-embed-coremaven | >=10.1.0-M1 <10.1.55 | 10.1.55 |
| org.apache.tomcat.embed:tomcat-embed-coremaven | >=11.0.0-M1 <11.0.22 | 11.0.22 |
| org.apache.tomcat:tomcatmaven | >=0 <9.0.118 | 9.0.118 |
| org.apache.tomcat:tomcatmaven | >=10.1.0-M1 <10.1.55 | 10.1.55 |
| org.apache.tomcat:tomcatmaven | >=11.0.0-M1 <11.0.22 | 11.0.22 |
| org.apache.tomcat:tomcat-catalinamaven | >=0 <9.0.118 | 9.0.118 |
| org.apache.tomcat:tomcat-catalinamaven | >=10.1.0-M1 <10.1.55 | 10.1.55 |
| org.apache.tomcat:tomcat-catalinamaven | >=11.0.0-M1 <11.0.22 | 11.0.22 |
Published upstream
May 12, 2026
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 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.
Quoted source text, attributed separately from HOL analysis.