GHSA-qq5r-98hh-rxc9
Apache Tomcat - Security constraint bypass with HTTP/0.9
Quick fix
GHSA-qq5r-98hh-rxc9 — org.apache.tomcat:tomcat-coyote: upgrade to the fixed version with the command below.
# pom.xml: bump <version>11.0.15</version> for org.apache.tomcat:tomcat-coyoteDetails
Improper Input Validation vulnerability in Apache Tomcat.
Tomcat did not limit HTTP/0.9 requests to the GET method. If a security constraint was configured to allow HEAD requests to a URI but deny GET requests, the user could bypass that constraint on GET requests by sending a (specification invalid) HEAD request using HTTP/0.9.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0.M1 through 9.0.112.
Older, EOL versions are also affected.
Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fixes the issue.
Are you affected?
Enter the version of the package you're using.
Affected packages
11.0.0-M1Fixed in: 11.0.15# pom.xml: bump <version>11.0.15</version> for org.apache.tomcat:tomcat-coyote10.1.0-M1Fixed in: 10.1.50# pom.xml: bump <version>10.1.50</version> for org.apache.tomcat:tomcat-coyote0Fixed in: 9.0.113# pom.xml: bump <version>9.0.113</version> for org.apache.tomcat:tomcat-coyoteReferences
- https://nvd.nist.gov/vuln/detail/CVE-2026-24733[ADVISORY]
- https://github.com/apache/tomcat/commit/2e2fa23f2635bbb819759576a2f2f5e64ecf7c5f[WEB]
- https://github.com/apache/tomcat/commit/6c73d74ff281260d74c836370ff6b82f1da8048b[WEB]
- https://github.com/apache/tomcat/commit/711b465cf22684a1acf0cb43501cdbbce9b6c5f4[WEB]
- https://github.com/apache/tomcat[PACKAGE]
- https://lists.apache.org/thread/6xk3t65qpn1myp618krtfotbjn1qt90f[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]