CVE-2026-24733 Apache Tomcat: Security constraint bypass with HTTP/0.9
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-24733?
CVE-2026-24733 is a medium-severity vulnerability in Apache Tomcat, published on 17 Feb 2026.
Official description
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.
Weakness: CWE-20
Which versions are affected by CVE-2026-24733?
7 open source packages ship an affected version, including org.apache.tomcat:tomcat-coyote and tomcat. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.tomcat:tomcat-coyote Maven | All versions | 9.0.113 |
org.apache.tomcat:tomcat-coyote Maven | All versions | 9.0.113 |
org.apache.tomcat:tomcat-coyote Maven | From 10.1.0-M1 | 10.1.50 |
org.apache.tomcat:tomcat-coyote Maven | From 10.1.0-M1 | 10.1.50 |
org.apache.tomcat:tomcat-coyote Maven | From 11.0.0-M1 | 11.0.15 |
org.apache.tomcat:tomcat-coyote Maven | From 11.0.0-M1 | 11.0.15 |
1 more packages
tomcat Bitnami | All versions | 9.0.113, 10.1.50, 11.0.15 |
Linux distribution packages (1)
tomcat SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 9.0.36-3.156.1 |
Products include Apache Tomcat.
How do I fix CVE-2026-24733?
Upgrade org.apache.tomcat:tomcat-coyote to a fixed version for your release line: 9.0.113, 10.1.50 or 11.0.15.
Is CVE-2026-24733 being exploited?
There is no known exploitation of CVE-2026-24733 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Apache Tomcat
Sources
Also known as BIT-tomcat-2026-24733, CLEANSTART-2026-PZ00337, CLSA-2026-1771978235, CLSA-2026-1772496672, CLSA-2026-1774859936, CLSA-2026-1775003158 and 13 more.