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CVE-2026-42498

Updated on 12 May 2026

Severity

7.3 High severity

Details

CVSS score
7.3
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.2 to 9.0.117 Older, unsupported versions may also be affected

Description: If a WebSocket request was redirected after authentication, Tomcat’s WebSocket client would present the most recent authentication header to the redirect target host.

Mitigation: Users of the affected versions should apply one of the following mitigations:

  • Upgrade to Apache Tomcat 11.0.22 or later
  • Upgrade to Apache Tomcat 10.1.55 or later
  • Upgrade to Apache Tomcat 9.0.118 or later

Credit: This issue was identified by lokerxx

Details

Affected product:
AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , Apache CXF , Apache Log4j , Apache Tapestry , Apache Tomcat , CentOS 7 ELS , Debian 10 ELS , Spring , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS , camel , grails-core , logging-flume , thrift
Affected packages:
tomcat9 @ 9.0.16 (+5199 more)

Fixes