CVE-2026-24733
February 17, 2026
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 Packages
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=11.0.0-M1 <11.0.15Fix Suggestion:
Update to version 11.0.15https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=10.1.0-M1 <10.1.50Fix Suggestion:
Update to version 10.1.50https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=9.0.0-M1 <9.0.113Fix Suggestion:
Update to version 9.0.113org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=9.0.0.M1 <9.0.113Fix Suggestion:
Update to version 9.0.113org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.50Fix Suggestion:
Update to version 10.1.50org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=11.0.0-M1 <11.0.15Fix Suggestion:
Update to version 11.0.15org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=11.0.0-M1 <11.0.15Fix Suggestion:
Update to version 11.0.15org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=7.0.0 <9.0.113Fix Suggestion:
Update to version 9.0.113org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.50Fix Suggestion:
Update to version 10.1.50org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.50Fix Suggestion:
Update to version 10.1.50org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=9.0.0.M1 <9.0.113Fix Suggestion:
Update to version 9.0.113org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=11.0.0-M1 <11.0.15Fix Suggestion:
Update to version 11.0.15org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=7.0.0 <9.0.113Fix Suggestion:
Update to version 9.0.113org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.50Fix Suggestion:
Update to version 10.1.50Related Resources (9)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
UNREPORTED
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Input Validation
EPSS
Base Score:
0.04
