Information disclosure in Apache Tomcat - CVE-2026-42498

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Main Vulnerability Database Vulnerabilities #VU131181

Information disclosure in Apache Tomcat - CVE-2026-42498

Published: May 12, 2026


Vulnerability identifier: #VU131181
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-42498
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Apache Foundation
Affected software:
Apache Tomcat

Detailed vulnerability description

The vulnerability allows a remote user to disclose authentication headers to a redirect target host.

The vulnerability exists due to exposure of sensitive information in Tomcat's WebSocket client when following a redirected WebSocket request after authentication. A remote user can trigger a redirect after authentication to disclose authentication headers to a redirect target host.

The issue occurs only if a WebSocket request is redirected after authentication.


How to mitigate CVE-2026-42498

Install security update from vendor's website.

Sources