GHSA-qq5r-98hh-rxc9
Apache Tomcat - Security constraint bypass with HTTP/0.9
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.apache.tomcat:tomcat-coyote | >= 11.0.0-M1, < 11.0.15 | 11.0.15 |
| Maven | org.apache.tomcat:tomcat-coyote | >= 10.1.0-M1, < 10.1.50 | 10.1.50 |
| Maven | org.apache.tomcat:tomcat-coyote | < 9.0.113 | 9.0.113 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-24733
- https://github.com/apache/tomcat/commit/2e2fa23f2635bbb819759576a2f2f5e64ecf7c5f
- https://github.com/apache/tomcat/commit/6c73d74ff281260d74c836370ff6b82f1da8048b
- https://github.com/apache/tomcat/commit/711b465cf22684a1acf0cb43501cdbbce9b6c5f4
- https://github.com/apache/tomcat
- https://lists.apache.org/thread/6xk3t65qpn1myp618krtfotbjn1qt90f
- https://tomcat.apache.org/security-10.html
- https://tomcat.apache.org/security-11.html
- https://tomcat.apache.org/security-9.html