Answer in brief
CVE-2026-41293 records a Critical severity (CVSS 9.8) vulnerability in Apache Tomcat - HTTP/2 request headers not validated. 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 9.8. 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 | >=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.embed:tomcat-embed-coremaven | >=8.5.0,<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:tomcatmaven | >=8.5.0,<9.0.118 | 9.0.118 |
| org.apache.tomcat:tomcat-coyotemaven | >=8.5.0,<9.0.118 | 9.0.118 |
| org.apache.tomcat:tomcat-coyotemaven | >=10.1.0-M1,<10.1.55 | 10.1.55 |
| org.apache.tomcat:tomcat-coyotemaven | >=11.0.0-M1,<11.0.22 | 11.0.22 |
Published upstream
May 12, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Aug 31, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Aug 31, 2026
Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected Description: HTTP/2 request headers were not validated which may have triggered unexpected application behaviour if the application (quite reasonably) assumed that header value exposed through the Servlet API would be specification compliant. Mitigation: Users of the affected versions should apply one of the following mitigations: - Upgrade to Apache Tomcat 11.0.22 or later - Upgrade to Apache Tomcat 10.1.55 or later - Upgrade to Apache Tomcat 9.0.118 or later Credit: This issue was identified by Dawit Jeong (@dawitngoliath)
Quoted source text, attributed separately from HOL analysis.