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CVE-2026-42498— Apache Tomcat: WebSocket authentication header exposure

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。用于实现对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat存在信息泄露漏洞，该漏洞源于WebSocket身份验证期间HTTP认证标头暴露给意外主机。以下版本受到影响：11.0.0-M1版本至11.0.21版本、10.1.0-M1版本至10.1.54版本、9.0.2版本至9.0.117版本、8.5.24版本至8.5.100版本和7.0.83版本至7.0.109版本。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.65% · P49

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 5

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat 11.0.0-M1≤ 11.0.21 affected
10.1.0-M1≤ 10.1.54 affected
9.0.2≤ 9.0.117 affected
8.5.24≤ 8.5.100 affected
7.0.83≤ 7.0.109 affected
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I. Basic Information for CVE-2026-42498

Vulnerability Information
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Vulnerability Title
Apache Tomcat: WebSocket authentication header exposure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。用于实现对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat存在信息泄露漏洞，该漏洞源于WebSocket身份验证期间HTTP认证标头暴露给意外主机。以下版本受到影响：11.0.0-M1版本至11.0.21版本、10.1.0-M1版本至10.1.54版本、9.0.2版本至9.0.117版本、8.5.24版本至8.5.100版本和7.0.83版本至7.0.109版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Tomcat 11.0.0-M1 ~ 11.0.21 -

II. Public POCs for CVE-2026-42498

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III. Intelligence Information for CVE-2026-42498

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Mailing List Discussions for CVE-2026-42498 (1)

Same Patch Batch · Apache Software Foundation · 2026-05-12 · 7 CVEs total

CVE-2026-41284 Apache Tomcat: Unbounded read in WebDAV LOCK and PROPFIND handling
CVE-2026-41293 Apache Tomcat: HTTP/2 request headers not validated
CVE-2026-43512 Apache Tomcat: Digest authenticator will authenticate any unknown user
CVE-2026-43513 Apache Tomcat: LockOutRealm treats user names as case-sensitive
CVE-2026-43514 Apache Tomcat: AJP secret compared in non-constant time
CVE-2026-43515 Apache Tomcat: Security constraints not correctly applied

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-200

V. Comments for CVE-2026-42498

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