vulnerability
Apache Tomcat: Low: WebSocket authentication header exposure (CVE-2026-42498)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:L/Au:N/C:P/I:P/A:P) | May 12, 2026 | May 12, 2026 | May 14, 2026 |
Severity
8
CVSS
(AV:N/AC:L/Au:N/C:P/I:P/A:P)
Published
May 12, 2026
Added
May 12, 2026
Modified
May 14, 2026
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.
Solutions
apache-tomcat-upgrade-10_1_55apache-tomcat-upgrade-11_0_22apache-tomcat-upgrade-9_0_118
Rapid7 Labs
2026 Global Threat Landscape Report
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