CVE-2026-41293: Apache Tomcat - HTTP/2 request headers not validated
(updated )
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)
References
- github.com/advisories/GHSA-r29c-68gh-xp6x
- github.com/apache/tomcat/commit/19f17a257797e8d139b33ff9c88d362a273be148
- github.com/apache/tomcat/commit/1c70480466572c9192ed412ebefcd43fc63137fd
- github.com/apache/tomcat/commit/2a2476460e823789f530a22207873ea8cd6eff3b
- github.com/apache/tomcat/commit/3915fd27e6810b14ccd21e3d900bd8faef44d3df
- github.com/apache/tomcat/commit/57c2b3bfd62792631e1df24cf4237b990a0b36fa
- github.com/apache/tomcat/commit/c2925554c677da57390f940d856871e18daaacab
- github.com/apache/tomcat/commit/cf9452443bcbf3b1a4b435ef7d624364f1b65ca3
- github.com/apache/tomcat/commit/e5cef9618c3f4fd31bd6fb1e83f0f18022280dac
- github.com/apache/tomcat/commit/f72a6174ab1f0f5a053435f80448b4f6837fe6d7
- lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r
- nvd.nist.gov/vuln/detail/CVE-2026-41293
- tomcat.apache.org/security-10.html
- tomcat.apache.org/security-11.html
- tomcat.apache.org/security-9.html
Code Behaviors & Features
Detect and mitigate CVE-2026-41293 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →