UpHeron
All vulnerabilities

Servers and applications

CVE-2026-66299

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…

Severity
Medium 5.3
Published
28 Jul 2026
Last changed
27 Aug 2026
Added to UpHeron
21 Oct 2026
Fixed in
9.0.121, 10.1.58, 11.0.25
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • From 11.0.1 before 11.0.25
  • Version 11.0.0-milestone26
  • Version 11.0.0-milestone25
  • Version 11.0.0-milestone24
All 10 release lines
  • From 9.0.89 before 9.0.121
  • From 10.1.24 before 10.1.58
  • Version 11.0.0-milestone20
  • Version 11.0.0-milestone21
  • Version 11.0.0-milestone22
  • Version 11.0.0-milestone23
  • Version 11.0.0-milestone24
  • Version 11.0.0-milestone25
  • Version 11.0.0-milestone26
  • From 11.0.1 before 11.0.25

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-66299
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-66299