CVE-2026-41293
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)
Package Versions Affected
Automatically patch vulnerabilities without upgrading
CVSS Version
Related Resources
References
https://nvd.nist.gov/vuln/detail/CVE-2026-41293, https://github.com/apache/tomcat/commit/19f17a257797e8d139b33ff9c88d362a273be148, https://github.com/apache/tomcat/commit/1c70480466572c9192ed412ebefcd43fc63137fd, https://github.com/apache/tomcat/commit/2a2476460e823789f530a22207873ea8cd6eff3b, https://github.com/apache/tomcat/commit/3915fd27e6810b14ccd21e3d900bd8faef44d3df, https://github.com/apache/tomcat/commit/57c2b3bfd62792631e1df24cf4237b990a0b36fa, https://github.com/apache/tomcat/commit/c2925554c677da57390f940d856871e18daaacab, https://github.com/apache/tomcat/commit/cf9452443bcbf3b1a4b435ef7d624364f1b65ca3, https://github.com/apache/tomcat/commit/e5cef9618c3f4fd31bd6fb1e83f0f18022280dac, https://github.com/apache/tomcat/commit/f72a6174ab1f0f5a053435f80448b4f6837fe6d7, https://github.com/apache/tomcat, https://lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r, https://tomcat.apache.org/security-10.html, https://tomcat.apache.org/security-11.html, https://tomcat.apache.org/security-9.html, http://www.openwall.com/lists/oss-security/2026/05/12/13