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CVE-2026-66299— Apache Tomcat: DoS via WebSocket chat example

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Apache基金会开源的一个Web应用服务器。 Apache Tomcat 11.0.0-M20版本至11.0.24版本、10.1.24版本至10.1.57版本和9.0.89版本至9.0.120版本存在资源管理错误漏洞，该漏洞源于WebSocket聊天示例存在资源未控制消耗，可能导致拒绝服务攻击。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.53% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 4

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat 11.0.0-M20≤ 11.0.24 affected
10.1.24≤ 10.1.57 affected
9.0.89≤ 9.0.120 affected
≤ 8.5.100 unaffected
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I. Basic Information for CVE-2026-66299

Vulnerability Information
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Vulnerability Title
Apache Tomcat: DoS via WebSocket chat example
Source: CVE Program / CVE List V5
Vulnerability Description
Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example. This issue affects Apache Tomcat: from 11.0.0-M20 through 11.0.24, from 10.1.24 through 10.1.57, from 9.0.89 through 9.0.120. Users who have followed the security guidance to remove the examples web application are not affected by this issue. Users are recommended to remove the examples web application or to upgrade to version 11.0.25, 10.1.58 or 9.0.121 (when released), which fix the issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国Apache基金会开源的一个Web应用服务器。 Apache Tomcat 11.0.0-M20版本至11.0.24版本、10.1.24版本至10.1.57版本和9.0.89版本至9.0.120版本存在资源管理错误漏洞，该漏洞源于WebSocket聊天示例存在资源未控制消耗，可能导致拒绝服务攻击。
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-M20 ~ 11.0.24 -

II. Public POCs for CVE-2026-66299

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III. Intelligence Information for CVE-2026-66299

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Mailing List Discussions for CVE-2026-66299 (1)

Same Patch Batch · Apache Software Foundation · 2026-07-28 · 4 CVEs total

CVE-2026-61487 Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Authorization bypass via tem
CVE-2026-59878 Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All: AMQP NIO negative frame size v
CVE-2026-66713 Apache Axis2/Java: deserialization of untrusted Data

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-400

V. Comments for CVE-2026-66299

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