CVE-2026-66299
Fixed in a distro release EPSS <1%CVSS 7.5
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.
Products: Apache Software Foundation Apache Tomcat
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | tomcat10 | no fix |
| Debian 12 | tomcat9 | 9.0.70-2 |
| Debian 13 | tomcat10 | no fix |
| Debian 13 | tomcat11 | no fix |
| Debian 13 | tomcat9 | 9.0.70-2 |
| Debian 14 | tomcat10 | 10.1.60-1 |
| Debian 14 | tomcat11 | no fix |
| Debian 14 | tomcat9 | 9.0.70-2 |
| Red Hat hummingbird 1 | tomcat11 | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-admin-webapps | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-common | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-docs-webapp | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-el-6.0-api | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-jsp-4.0-api | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-lib | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-servlet-6.1-api | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-user-instance | 0:11.0.25-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-webapps | 0:11.0.25-0.1.hum1 |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-admin-webapps | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-admin-webapps | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-admin-webapps | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-docs-webapp | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-docs-webapp | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-docs-webapp | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-el-5.0-api | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-el-5.0-api | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-el-5.0-api | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-javadoc | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-javadoc | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-javadoc | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-jsp-3.1-api | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-jsp-3.1-api | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-jsp-3.1-api | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-lib | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-lib | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-lib | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-selinux | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-selinux | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-selinux | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-servlet-6.0-api | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-servlet-6.0-api | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-servlet-6.0-api | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-webapps | 0:10.1.49-16.redhat_00016.1.el8jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-webapps | 0:10.1.49-16.redhat_00016.1.el9jws |
| Red Hat jboss enterprise web server 6.2 | jws6-tomcat-webapps | 0:10.1.49-16.redhat_00016.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-admin-webapps | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-admin-webapps | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-admin-webapps | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-docs-webapp | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-docs-webapp | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-docs-webapp | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-el-5.0-api | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-el-5.0-api | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-el-5.0-api | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-javadoc | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-javadoc | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-javadoc | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-jsp-3.1-api | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-jsp-3.1-api | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-jsp-3.1-api | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-lib | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-lib | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-lib | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-selinux | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-selinux | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-selinux | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-servlet-6.0-api | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-servlet-6.0-api | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-servlet-6.0-api | 0:11.0.21-7.redhat_00006.1.el9jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-webapps | 0:11.0.21-7.redhat_00006.1.el8jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-webapps | 0:11.0.21-7.redhat_00006.1.el10jws |
| Red Hat jboss enterprise web server 7.0 | jws7-tomcat-webapps | 0:11.0.21-7.redhat_00006.1.el9jws |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | tomcat10 | 10.1.59-150200.5.79.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | tomcat10 | 10.1.59-150200.5.79.1 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat10 | 10.1.59-150200.5.79.1 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat11 | 11.0.25-150600.13.33.2 |
| SUSE Linux Enterprise Server 12 SP5-LTSS | tomcat | 9.0.121-3.177.3 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | tomcat10 | 10.1.59-150200.5.79.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | tomcat10 | 10.1.59-150200.5.79.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | tomcat11 | 11.0.25-150600.13.33.2 |
| SUSE Linux Enterprise Server 16.0 | tomcat | 9.0.121-160000.1.1 |
| SUSE Linux Enterprise Server 16.0 | tomcat10 | 10.1.59-160000.1.1 |
| SUSE Linux Enterprise Server 16.0 | tomcat11 | 11.0.25-160000.1.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | tomcat | 9.0.121-3.177.3 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | tomcat10 | 10.1.59-150200.5.79.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | tomcat | 9.0.121-150200.120.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | tomcat10 | 10.1.59-150200.5.79.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | tomcat11 | 11.0.25-150600.13.33.2 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat | 9.0.121-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat10 | 10.1.59-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat11 | 11.0.25-160000.1.1 |
| Ubuntu 24.04 LTS | tomcat10 | no fix |
| Ubuntu 24.04 LTS | tomcat9 | no fix |
| Ubuntu 26.04 LTS | tomcat10 | no fix |
| Ubuntu 26.04 LTS | tomcat11 | no fix |
| Ubuntu 26.04 LTS | tomcat9 | no fix |
| Ubuntu 26.10 | tomcat10 | no fix |
| Ubuntu 26.10 | tomcat11 | no fix |
| Ubuntu 26.10 | tomcat9 | no fix |
| Ubuntu Pro 14.04 LTS | tomcat6 | no fix |
| Ubuntu Pro 14.04 LTS | tomcat7 | no fix |
| Ubuntu Pro 16.04 LTS | tomcat7 | no fix |
| Ubuntu Pro 16.04 LTS | tomcat8 | no fix |
| Ubuntu Pro 18.04 LTS | tomcat8 | no fix |
| Ubuntu Pro 18.04 LTS | tomcat9 | no fix |
| Ubuntu Pro 20.04 LTS | tomcat9 | no fix |
| Ubuntu Pro 22.04 LTS | tomcat9 | no fix |
| openSUSE Leap 16.0 | tomcat | 9.0.121-160000.1.1 |
| openSUSE Leap 16.0 | tomcat10 | 10.1.59-160000.1.1 |
| openSUSE Leap 16.0 | tomcat11 | 11.0.25-160000.1.1 |
| openSUSE Tumbleweed | tomcat | 9.0.121-1.1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.59-1.1 |
| openSUSE Tumbleweed | tomcat11 | 11.0.25-1.1 |