CVE-2026-42498

Severity CVSS v4.0:

Pending analysis

Type:

CWE-200 Information Leak / Disclosure

Publication date:

12/05/2026

Last modified:

14/05/2026

Description

Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat.<br /> <br /> 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.<br /> <br /> Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS v3.1 Severity and Metrics:

Base Score: 7.30 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): Low

Base Score 3.x

7.30

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:apache:tomcat::::::::	7.0.0 (including)	7.0.109 (including)
cpe:2.3:a:apache:tomcat::::::::	8.5.0 (including)	8.5.100 (including)
cpe:2.3:a:apache:tomcat::::::::	9.0.0 (including)	9.0.118 (excluding)
cpe:2.3:a:apache:tomcat::::::::	10.1.0 (including)	10.1.55 (excluding)
cpe:2.3:a:apache:tomcat::::::::	11.0.0 (including)	11.0.22 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-42498

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools