Insufficient Session Expiration

Overview org.apache.tomcat:tomcat-websocket is a Tomcat WebSocket JSR356 implementation. Affected versions of this package are vulnerable to Insufficient Session Expiration due to the improper termination of WebSocket sessions when the associated HTTP session ends. An attacker can maintain access...

Astra Linux – Vulnerability in Tomcat9

Exposure of the HTTP Authentication Header to unexpected hosts during the WebSocket authentication vulnerability in Apache Tomcat. This issue affects Apache Tomcat: versions 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, an...

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 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...

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...

Information Disclosure org.apache.tomcat:tomcat-websocket Dependency in Jira Service Management Data Center and Server

This High severity Information Disclosure vulnerability was introduced in versions 5.16.0, 5.17.0, 10.0.1, 10.1.1, 10.2.0, 10.3.0, 10.4.0, 10.5.0, 10.6.0, 10.7.1, 11.0.0, 11.1.0, 11.2.0, and 11.3.0 of Jira Service Management Data Center and Server. This Information Disclosure vulnerability, with ...

Information Disclosure org.apache.tomcat:tomcat-websocket Dependency in Confluence Data Center

This High severity Information Disclosure vulnerability was introduced in versions 6.13.0, 7.4.0, 7.13.0, 7.19.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.1, and 10.2.0 of Confluence Data Center. This Information Disclosure vulnerability, with a CVSS Score of 7.3 and a...

Exposure of Private Personal Information to an Unauthorized Actor

Overview org.apache.tomcat:tomcat-websocket is a Tomcat WebSocket JSR356 implementation. Affected versions of this package are vulnerable to Exposure of Private Personal Information to an Unauthorized Actor in WebSocket client during authentication. An attacker can obtain sensitive HTTP...

Important: tomcat

Issue Overview: Denial of Service via incomplete cleanup vulnerability in Apache Tomcat. It was possible for WebSocket clients to keep WebSocket connections open leading to increased resource consumption.This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.0-M16, from 10.1.0-M1 through...

Denial Of Service (DoS)

tomcat-websocket is vulnerable to denial of service DoS attacks. An out of memory OOM occurs as the internal upgrade handler doesn't close the associated web connection on destroy causing an application crash...

Insecure Defaults

tomcat-websocket is vulnerable to missing hostname verification. The application does not verify the hostname with a client when establishing a TLS connection through the websocket, allowing a malicious user to impersonate a different host machine...