Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / maven/org.apache.tomcat/tomcat-catalina/CVE-2026-24733
Advisory ID gitlab/maven/org.apache.tomcat/tomcat-catalina/CVE-2026-24733
Aliases CVE-2026-24733
GHSA-qq5r-98hh-rxc9
Summary Apache Tomcat - Security constraint bypass with HTTP/0.9 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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-20 Improper Input Validation
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat/tomcat-catalina/CVE-2026-24733.yml
Reference id Reference type URL
https://github.com/apache/tomcat
https://github.com/apache/tomcat/commit/2e2fa23f2635bbb819759576a2f2f5e64ecf7c5f
https://github.com/apache/tomcat/commit/6c73d74ff281260d74c836370ff6b82f1da8048b
https://github.com/apache/tomcat/commit/711b465cf22684a1acf0cb43501cdbbce9b6c5f4
https://lists.apache.org/thread/6xk3t65qpn1myp618krtfotbjn1qt90f
https://tomcat.apache.org/security-10.html
https://tomcat.apache.org/security-11.html
https://tomcat.apache.org/security-9.html
CVE-2026-24733 https://nvd.nist.gov/vuln/detail/CVE-2026-24733
GHSA-qq5r-98hh-rxc9 https://github.com/advisories/GHSA-qq5r-98hh-rxc9
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat/tomcat-catalina/CVE-2026-24733.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-21T21:16:58Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/24xxx/CVE-2026-24733.json

Source Advisory: vulnrichment/CVE-2026-24733

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]