CVE-2026-42498

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.

CVSS v3 7.3 HIGH

7.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb	Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/12/14	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:apache:tomcat::::::::
	cpe:2.3:a:apache:tomcat::::::::
	cpe:2.3:a:apache:tomcat::::::::
	cpe:2.3:a:apache:tomcat::::::::
	cpe:2.3:a:apache:tomcat::::::::

History

14 May 2026, 18:51

Type	Values Removed	Values Added
CPE		cpe:2.3:a:apache:tomcat::::::::
References	~~() https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb -~~	() https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb - Mailing List, Vendor Advisory
References	~~() http://www.openwall.com/lists/oss-security/2026/05/12/14 -~~	() http://www.openwall.com/lists/oss-security/2026/05/12/14 - Mailing List, Third Party Advisory
First Time		Apache tomcat Apache

13 May 2026, 16:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.3

12 May 2026, 18:17

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/05/12/14 -

12 May 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-12 16:16

Updated : 2026-05-14 18:51

NVD link : CVE-2026-42498

Mitre link : CVE-2026-42498

CVE.ORG link : CVE-2026-42498

JSON object : View

Products Affected

apache

tomcat

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

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