Resource Exhaustion Affecting tomcat9 package, versions <9.0.70-2


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.53% (43rd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-DEBIANUNSTABLE-TOMCAT9-18391949
  • published29 Jul 2026
  • disclosed28 Jul 2026

Introduced: 28 Jul 2026

CVE-2026-66299  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade Debian:unstable tomcat9 to version 9.0.70-2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tomcat9 package and not the tomcat9 package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1