CVE-2026-42498
Published:May 12, 2026
Updated:May 17, 2026
Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109.
Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.
Affected Packages
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=9.0.2 <9.0.118Fix Suggestion:
Update to version 9.0.118https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=11.0.0-M1 <11.0.22Fix Suggestion:
Update to version 11.0.22https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=10.1.0-M1 <10.1.55Fix Suggestion:
Update to version 10.1.55org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=11.0.0-M1 <11.0.22Fix Suggestion:
Update to version 11.0.22org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.55Fix Suggestion:
Update to version 10.1.55org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=9.0.2 <9.0.118Fix Suggestion:
Update to version 9.0.118Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Exposure of Sensitive Information to an Unauthorized Actor