GHSA-r29c-68gh-xp6x
Apache Tomcat - HTTP/2 request headers not validated
Quick fix
GHSA-r29c-68gh-xp6x — org.apache.tomcat.embed:tomcat-embed-core: upgrade to the fixed version with the command below.
# pom.xml: bump <version>9.0.118</version> for org.apache.tomcat.embed:tomcat-embed-coreDetails
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)
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Affected packages
8.5.0Fixed in: 9.0.118# pom.xml: bump <version>9.0.118</version> for org.apache.tomcat.embed:tomcat-embed-core10.1.0-M1Fixed in: 10.1.55# pom.xml: bump <version>10.1.55</version> for org.apache.tomcat.embed:tomcat-embed-core11.0.0-M1Fixed in: 11.0.22# pom.xml: bump <version>11.0.22</version> for org.apache.tomcat.embed:tomcat-embed-core8.5.0Fixed in: 9.0.118# pom.xml: bump <version>9.0.118</version> for org.apache.tomcat:tomcat10.1.0-M1Fixed in: 10.1.55# pom.xml: bump <version>10.1.55</version> for org.apache.tomcat:tomcat11.0.0-M1Fixed in: 11.0.22# pom.xml: bump <version>11.0.22</version> for org.apache.tomcat:tomcat8.5.0Fixed in: 9.0.118# pom.xml: bump <version>9.0.118</version> for org.apache.tomcat:tomcat-coyote10.1.0-M1Fixed in: 10.1.55# pom.xml: bump <version>10.1.55</version> for org.apache.tomcat:tomcat-coyote11.0.0-M1Fixed in: 11.0.22# pom.xml: bump <version>11.0.22</version> for org.apache.tomcat:tomcat-coyoteReferences
- https://nvd.nist.gov/vuln/detail/CVE-2026-41293[ADVISORY]
- https://github.com/apache/tomcat/commit/19f17a257797e8d139b33ff9c88d362a273be148[WEB]
- https://github.com/apache/tomcat/commit/1c70480466572c9192ed412ebefcd43fc63137fd[WEB]
- https://github.com/apache/tomcat/commit/2a2476460e823789f530a22207873ea8cd6eff3b[WEB]
- https://github.com/apache/tomcat/commit/3915fd27e6810b14ccd21e3d900bd8faef44d3df[WEB]
- https://github.com/apache/tomcat/commit/57c2b3bfd62792631e1df24cf4237b990a0b36fa[WEB]
- https://github.com/apache/tomcat/commit/c2925554c677da57390f940d856871e18daaacab[WEB]
- https://github.com/apache/tomcat/commit/cf9452443bcbf3b1a4b435ef7d624364f1b65ca3[WEB]
- https://github.com/apache/tomcat/commit/e5cef9618c3f4fd31bd6fb1e83f0f18022280dac[WEB]
- https://github.com/apache/tomcat/commit/f72a6174ab1f0f5a053435f80448b4f6837fe6d7[WEB]
- https://github.com/apache/tomcat[PACKAGE]
- https://lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r[WEB]
- https://tomcat.apache.org/security-10.html[WEB]
- https://tomcat.apache.org/security-11.html[WEB]
- https://tomcat.apache.org/security-9.html[WEB]
- http://www.openwall.com/lists/oss-security/2026/05/12/13[WEB]