CVE-2026-42498 Security Details

CVE ID

CVE-2026-42498

CWE

CWE-200

CVE 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.

Published

May 13, 2026

CVSS Score & Severity

8.7High

CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

EPSS Score

0.117%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/apache/tomcat/websocket/WsWebSocketContainer.connectToServerRecursive(Lorg/apache/tomcat/websocket/ClientEndpointHolder;Ljavax/websocket/ClientEndpointConfig;Ljava/net/URI;Ljava/util/Set;)Ljavax/websocket/Session;

JVMVulnerable params: 1

Affected Ecosystems

affected

Source

National Vulnerability Database

References

Apache · AnnouncementPROJECT

openwall.comTHIRD_PARTY