tomcat9: Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example
CVE-2026-66299 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-66299, released July 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jws6-tomcat · RHEL 10 | 10.1.49-16.redhat_00016.1.el10jws | RHSA-2026:73981 | Aug 25, 2026 |
| tomcat · opensuse-leap 16.0 | 9.0.121-160000.1.1 | OPENSUSE-SU-2026:21823-1 | Sep 9, 2026 |
| tomcat · sles 15.6 | 9.0.121-150200.120.1 | SUSE-SU-2026:4203-1 | Sep 16, 2026 |
| tomcat · sles 15.7 | 9.0.121-150200.120.1 | SUSE-SU-2026:4203-1 | Sep 16, 2026 |
| tomcat · sles 16.0 | 9.0.121-160000.1.1 | SUSE-SU-2026:23720-1 | Sep 9, 2026 |
| tomcat10 · Debian 14 | 10.1.60-1 | DEBIAN-CVE-2026-66299 | Jul 31, 2026 |
| tomcat10 · opensuse-leap 16.0 | 10.1.59-160000.1.1 | OPENSUSE-SU-2026:21810-1 | Sep 8, 2026 |
| tomcat10 · sles 15.6 | 10.1.59-150200.5.79.1 | SUSE-SU-2026:4119-1 | Sep 10, 2026 |
| tomcat10 · sles 15.7 | 10.1.59-150200.5.79.1 | SUSE-SU-2026:4119-1 | Sep 10, 2026 |
| tomcat10 · sles 16.0 | 10.1.59-160000.1.1 | SUSE-SU-2026:23711-1 | Sep 8, 2026 |
| tomcat11 · opensuse-leap 16.0 | 11.0.25-160000.1.1 | OPENSUSE-SU-2026:21811-1 | Sep 8, 2026 |
| tomcat11 · sles 15.6 | 11.0.25-150600.13.33.2 | SUSE-SU-2026:4114-1 | Sep 9, 2026 |
| tomcat11 · sles 15.7 | 11.0.25-150600.13.33.2 | SUSE-SU-2026:4114-1 | Sep 9, 2026 |
| tomcat11 · sles 16.0 | 11.0.25-160000.1.1 | SUSE-SU-2026:23710-1 | Sep 8, 2026 |
| tomcat9 · Debian 12.15 (bookworm) | 9.0.70-2 | DEBIAN-CVE-2026-66299 | Jul 31, 2026 |
| tomcat9 · Debian 13.5 (trixie) | 9.0.70-2 | DEBIAN-CVE-2026-66299 | Jul 31, 2026 |
| tomcat9 · Debian 14 | 9.0.70-2 | DEBIAN-CVE-2026-66299 | Jul 31, 2026 |
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