Improper input validation in Apache Tomcat
CVE-2026-24733
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.005 (39.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Apache Tomcat — versions 9.0.0, 10.0.0, 11.0.0
- Apache Software Foundation Tomcat — versions 11.0.0-M1, 10.1.0-M1, 9.0.0.M1
Weakness classification (CWE)
References
- security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-24733?
- CVE-2026-24733 is a low-severity vulnerability in Apache Tomcat, classified under Improper Input Validation. CVSS score: 3.7/10. Published 2026-02-17.
- How severe is CVE-2026-24733?
- Low severity. CVSS v3 base score is 3.7 out of 10.