Bug 2440437 (CVE-2026-24733)

Summary:	CVE-2026-24733 tomcat: security constraint bypass with HTTP/0.9
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	csutherl, dsoumis, jclere, jwon, pjindal, plodge, rhel-process-autobot, rmaucher, szappis, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in Tomcat. An improper input validation vulnerability allows an attacker to bypass security constraints. Specifically, if a security constraint is configured to permit HEAD requests to a URI but deny GET requests, a malformed or specification invalid HEAD request using the HTTP/0.9 protocol can bypass the intended denial rule, enabling an attacker to access resources that should be protected.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2440786
Bug Blocks:

Description OSIDB Bzimport 2026-02-17 20:05:27 UTC

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.

Comment 3 errata-xmlrpc 2026-04-30 13:58:29 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2.2

Via RHSA-2026:12195 https://access.redhat.com/errata/RHSA-2026:12195

Comment 4 errata-xmlrpc 2026-04-30 13:59:46 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2 on RHEL 10
  Red Hat JBoss Web Server 6.2 on RHEL 8
  Red Hat JBoss Web Server 6.2 on RHEL 9

Via RHSA-2026:12194 https://access.redhat.com/errata/RHSA-2026:12194