CVE-2026-77791
Fixed in a distro release EPSS <1%CVSS 7.5
Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack. This issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.74 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.88 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, 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 | tomcat10 | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-admin-webapps | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-common | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-docs-webapp | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-el-5.0-api | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-jsp-3.1-api | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-lib | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-servlet-6.0-api | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-user-instance | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat10-webapps | 0:10.1.60-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11 | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-admin-webapps | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-common | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-docs-webapp | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-el-6.0-api | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-jsp-4.0-api | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-lib | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-servlet-6.1-api | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-user-instance | 0:11.0.26-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-webapps | 0:11.0.26-0.1.hum1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | libtcnative-1-0 | 1.3.9-150200.6.11.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | libtcnative-1-0 | 1.3.9-150200.6.11.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | libtcnative-1-0 | 1.3.9-150200.6.11.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | tomcat10 | 10.1.60-150200.5.82.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | libtcnative-1-0 | 1.3.9-150200.6.11.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | tomcat10 | 10.1.60-150200.5.82.2 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | libtcnative-1-0 | 1.3.9-150600.16.9.2 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | libtcnative-1-0 | 1.3.9-150600.16.9.2 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat10 | 10.1.60-150200.5.82.2 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat11 | 11.0.26-150600.13.36.2 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | libtcnative-1-0 | 1.3.9-150200.6.11.2 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | libtcnative-1-0 | 1.3.9-150200.6.11.2 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | tomcat10 | 10.1.60-150200.5.82.2 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | libtcnative-1-0 | 1.3.9-150600.16.9.2 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | tomcat10 | 10.1.60-150200.5.82.2 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | tomcat11 | 11.0.26-150600.13.36.2 |
| SUSE Linux Enterprise Server 16.0 | libtcnative-1-0 | 1.3.9-160000.1.1 |
| SUSE Linux Enterprise Server 16.0 | libtcnative-2-0 | 2.0.16-160000.1.1 |
| SUSE Linux Enterprise Server 16.0 | tomcat | 9.0.122-160000.1.1 |
| SUSE Linux Enterprise Server 16.0 | tomcat10 | 10.1.60-160000.1.1 |
| SUSE Linux Enterprise Server 16.0 | tomcat11 | 11.0.26-160000.1.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | libtcnative-1-0 | 1.3.9-150200.6.11.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | libtcnative-1-0 | 1.3.9-150200.6.11.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | tomcat10 | 10.1.60-150200.5.82.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | libtcnative-1-0 | 1.3.9-150600.16.9.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | tomcat | 9.0.122-150200.123.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | tomcat10 | 10.1.60-150200.5.82.2 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | tomcat11 | 11.0.26-150600.13.36.2 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | libtcnative-1-0 | 1.3.9-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | libtcnative-2-0 | 2.0.16-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat | 9.0.122-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat10 | 10.1.60-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat11 | 11.0.26-160000.1.1 |
| 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 | libtcnative-1-0 | 1.3.9-160000.1.1 |
| openSUSE Leap 16.0 | libtcnative-2-0 | 2.0.16-160000.1.1 |
| openSUSE Leap 16.0 | tomcat | 9.0.122-160000.1.1 |
| openSUSE Leap 16.0 | tomcat10 | 10.1.60-160000.1.1 |
| openSUSE Leap 16.0 | tomcat11 | 11.0.26-160000.1.1 |
| openSUSE Tumbleweed | tomcat | 9.0.122-1.1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.60-1.1 |
| openSUSE Tumbleweed | tomcat11 | 11.0.26-1.1 |