Allocation of Resources Without Limits or Throttling Affecting org.apache.tomcat:tomcat package, versions [9.0.89, 9.0.121)[10.1.24, 10.1.58)[11.0.0-M20, 11.0.25)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published27 Aug 2026
- disclosed28 Jul 2026
- credit4ra1n, unam4, pyn3rd
Introduced: 28 Jul 2026
CVE-2026-66299 (opens in a new tab)How to fix?
Upgrade org.apache.tomcat:tomcat to version 9.0.121, 10.1.58, 11.0.25 or higher.
Overview
org.apache.tomcat:tomcat is an implementation of the Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies.
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 requests to the WebSocket chat endpoint, potentially leading to service disruption.