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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (41.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
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)
Public proof-of-concept exploits
References
- lists.apache.org/thread/6xk3t65qpn1myp618krtfotbjn1qt90f (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.
- Is CVE-2026-24733 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.