CVE-2026-42498

CVE-2026-42498: Apache Tomcat: WebSocket authentication header exposure

Vendor Apache Software Foundation
Product Apache Tomcat
Weakness CWE-200 · Info exposure
Published May 12, 2026
Last update May 13, 2026

CVSS base score

What the vulnerability does

Description

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.

Key dates

Disclosure timeline

May 12, 2026 CVE published
May 13, 2026 Record updated