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Message-ID: <78106398-86b7-4da1-9919-1790e35a22e7@apache.org>
Date: Tue, 12 May 2026 16:18:27 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-42498: Apache Tomcat: WebSocket authentication header
exposure
Severity: low
Affected versions:
- Apache Tomcat 11.0.0-M1 through 11.0.21
- Apache Tomcat 10.1.0-M1 through 10.1.54
- Apache Tomcat 9.0.2 through 9.0.117
- Apache Tomcat 8.5.24 through 8.5.100
- Apache Tomcat 7.0.83 through 7.0.109
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.
Credit:
lokerxx (finder)
References:
https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-42498
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