CVE-2026-24733 — Apache Tomcat: Security constraint bypass with HTTP/0.9

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Apache Software Foundation / Apache Tomcat	affected 11.0.0-M1 through 11.0.14; affected 10.1.0-M1 through 10.1.49; affected 9.0.0.M1 through 9.0.112; affected 0 through 8.5.100

CWE

CWE-20

References

https://lists.apache.org/thread/6xk3t65qpn1myp618krtfotbjn1qt90f

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.