CVE-2026-42498

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.

Score

CVSS 3.1 7.3 High

Status

Analyzed - security@apache.org

Published

2026-05-12

Last modified

2026-10-26

Weaknesses

CWE-200

Affected products

• Tomcat (Apache)
• Apache Tomcat (Apache Software Foundation)

References

• https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb
• http://www.openwall.com/lists/oss-security/2026/05/12/14