Allocation of Resources Without Limits or Throttling

Overview org.apache.tomcat:tomcat is an implementation of the Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies. Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the WebSocket chat example. An attack...

Allocation of Resources Without Limits or Throttling

Overview org.apache.tomcat:tomcat-websocket is a Tomcat WebSocket JSR356 implementation. Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the WebSocket chat example. An attacker can exhaust system resources by sending a large number of...

CVE-2026-66299

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...

DEBIAN-CVE-2026-66299

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...

CVE-2026-66299

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...

UBUNTU-CVE-2026-66299

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...

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

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...

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

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...

EUVD-2026-49855

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...

CVE-2026-66299

Summary: CVE-2026-66299 describes an Uncontrolled Resource Consumption (DoS) in Apache Tomcat’s WebSocket chat example. The vulnerability affects Tomcat versions 11.0.0-M20 through 11.0.24, 10.1.24 through 10.1.57, and 9.0.89 through 9.0.120. The root cause is an unbounded buffer for undelivered ...

CVE-2026-66299

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...

CVE-2026-66299

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...

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

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...

Fixed in Apache Tomcat 10.1.58

Low: DoS in WebSocket chat example CVE-2026-66299 The WebSocket chat example provided an unbounded buffer for undelivered messages. A maliciously slow client could cause the buffer to grow continuously, eventually leading to an memory exhaustion and failure of the Tomcat process. This was fixed...

CVE-2026-66713

CVE-2026-66713 affects Apache Axis2/Java up to version 2.0.0 on Tomcat, where the Tribes-based clustering feature (off by default) allows an unauthenticated remote attacker to execute arbitrary code via a crafted serialized Java object delivered to the cluster port. The vulnerability occurs durin...

CVE-2026-18047

A flaw was found in Dogtag PKI's ACME responder where the web.xml security constraints use exact URL pattern matching for admin-only enable/disable endpoints. By appending a trailing slash to the URL, an unauthenticated attacker can bypass the Tomcat authentication constraint while RESTEasy still...

PT-2026-65495

Name of the Vulnerable Software and Affected Versions Apache Tomcat versions 11.0.0-M20 through 11.0.24 Apache Tomcat versions 10.1.24 through 10.1.57 Apache Tomcat versions 9.0.89 through 9.0.120 Description An uncontrolled resource consumption issue exists in the WebSocket chat example. The...

OPENSUSE-SU-2026:11401-1 tomcat11-11.0.24-1.1 on GA media

These are all security issues fixed in the tomcat11-11.0.24-1.1 package on the GA media of openSUSE Tumbleweed...

OPENSUSE-SU-2026:11399-1 tomcat-9.0.120-1.1 on GA media

These are all security issues fixed in the tomcat-9.0.120-1.1 package on the GA media of openSUSE Tumbleweed...

PT-2026-65459

A flaw was found in Dogtag PKI's ACME responder where the web.xml security constraints use exact URL pattern matching for admin-only enable/disable endpoints. By appending a trailing slash to the URL, an unauthenticated attacker can bypass the Tomcat authentication constraint while RESTEasy still...