#VU122997 Protection mechanism failure in Apache Tomcat - CVE-2026-24733
Published: February 17, 2026 / Updated: February 18, 2026
Vulnerability identifier: #VU122997
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-24733
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Apache Tomcat
Apache Tomcat
Software vendor:
Apache Foundation
Apache Foundation
Description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures when handling HTTP/0.9 requests. If the server is configured to allow HEAD requests to a URI but deny GET requests, an attacker can bypass that constraint on GET requests by sending a (specification invalid) HEAD request.
Remediation
Install updates from vendor's website.
External links
- https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.50
- https://github.com/apache/tomcat/commit/711b465cf22684a1acf0cb43501cdbbce9b6c5f4
- https://github.com/apache/tomcat/commit/6c73d74ff281260d74c836370ff6b82f1da8048b
- https://github.com/apache/tomcat/commit/2e2fa23f2635bbb819759576a2f2f5e64ecf7c5f
- https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.113
- https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.15
- https://lists.apache.org/thread/y5zdwotqzxompqf7133gr43nmk05n142