Open-source package vulnerability · Maven

CVE-2026-41293: Apache Tomcat - HTTP/2 request headers not validated

criticalCVSS 3.1 9.8GHSA-r29c-68gh-xp6x

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.

Published May 12, 2026 · Updated Aug 31, 2026

Affected packages

org.apache.tomcat.embed:tomcat-embed-core

Ecosystem: Maven
Affected: >= 10.1.0-M1, < 10.1.55
Fixed in: 10.1.55
Check: mvn dependency:tree -Dincludes=org.apache.tomcat.embed:tomcat-embed-core

org.apache.tomcat.embed:tomcat-embed-core

Ecosystem: Maven
Affected: >= 11.0.0-M1, < 11.0.22
Fixed in: 11.0.22
Check: mvn dependency:tree -Dincludes=org.apache.tomcat.embed:tomcat-embed-core

org.apache.tomcat:tomcat

Ecosystem: Maven
Affected: >= 10.1.0-M1, < 10.1.55
Fixed in: 10.1.55
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat

org.apache.tomcat:tomcat

Ecosystem: Maven
Affected: >= 11.0.0-M1, < 11.0.22
Fixed in: 11.0.22
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat

org.apache.tomcat.embed:tomcat-embed-core

Ecosystem: Maven
Affected: >= 8.5.0, < 9.0.118
Fixed in: 9.0.118
Check: mvn dependency:tree -Dincludes=org.apache.tomcat.embed:tomcat-embed-core

org.apache.tomcat:tomcat

Ecosystem: Maven
Affected: >= 8.5.0, < 9.0.118
Fixed in: 9.0.118
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat

org.apache.tomcat:tomcat-coyote

Ecosystem: Maven
Affected: >= 8.5.0, < 9.0.118
Fixed in: 9.0.118
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat-coyote

org.apache.tomcat:tomcat-coyote

Ecosystem: Maven
Affected: >= 10.1.0-M1, < 10.1.55
Fixed in: 10.1.55
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat-coyote

org.apache.tomcat:tomcat-coyote

Ecosystem: Maven
Affected: >= 11.0.0-M1, < 11.0.22
Fixed in: 11.0.22
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat-coyote

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

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)

Credited to sealbenb.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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