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.
CVSS Details
- CVSS 3.1 Base Score: 3.7
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade tomcat-docs-webappUpgrade tomcat-jsp-2.3-apiUpgrade tomcat-servlet-3.0-apiUpgrade tomcat-libUpgrade tomcatUpgrade tomcat-el-3.0-apiUpgrade tomcat-admin-webappsUpgrade tomcat-servlet-4.0-apiUpgrade tomcat-jsp-2.2-apiUpgrade tomcat-javadocUpgrade tomcat-el-2.2-apiUpgrade tomcat-webappsUpgrade tomcat-jsvc | May 20, 2026 | May 20, 2026 |
| Apache Tomcat | — | Upgrade Apache Tomcat to 10.1.50Upgrade Apache Tomcat to 9.0.113Upgrade Apache Tomcat to 11.0.15Upgrade Apache Tomcat to the latest available version | Feb 18, 2026 | Feb 17, 2026 |
| Debian | — | Upgrade tomcat11Upgrade tomcat9Upgrade tomcat10 | Feb 19, 2026 | Feb 19, 2026 |
| Redhat_linux | — | Upgrade jws6-tomcat-javadocUpgrade tomcat9-jsp-2.3-apiUpgrade jws6-tomcat-el-5.0-apiUpgrade tomcat9Upgrade jws6-tomcat-webappsUpgrade jws6-tomcat-selinuxUpgrade jws6-tomcatUpgrade jws6-tomcat-docs-webappUpgrade tomcat9-admin-webappsUpgrade jws6-tomcat-jsp-3.1-apiUpgrade jws6-tomcat-libUpgrade jws6-tomcat-servlet-6.0-apiUpgrade tomcat9-webappsUpgrade tomcat9-el-3.0-apiUpgrade tomcat9-servlet-4.0-apiUpgrade tomcat9-libUpgrade jws6-tomcat-admin-webappsNo solution existsUpgrade tomcat9-docs-webapp | May 4, 2026 | Feb 17, 2026 |
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