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Vulnerability Details 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 to upgrade to version 11.0.25, 10.1.58 or 9.0.121 (when released), which fix the issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 23.4%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-66299
  • Apache » Tomcat » Version: 10.1.24
    cpe:2.3:a:apache:tomcat:10.1.24
  • Apache » Tomcat » Version: 10.1.25
    cpe:2.3:a:apache:tomcat:10.1.25
  • Apache » Tomcat » Version: 10.1.26
    cpe:2.3:a:apache:tomcat:10.1.26
  • Apache » Tomcat » Version: 10.1.27
    cpe:2.3:a:apache:tomcat:10.1.27
  • Apache » Tomcat » Version: 10.1.28
    cpe:2.3:a:apache:tomcat:10.1.28
  • Apache » Tomcat » Version: 10.1.29
    cpe:2.3:a:apache:tomcat:10.1.29
  • Apache » Tomcat » Version: 10.1.30
    cpe:2.3:a:apache:tomcat:10.1.30
  • Apache » Tomcat » Version: 10.1.31
    cpe:2.3:a:apache:tomcat:10.1.31
  • Apache » Tomcat » Version: 10.1.32
    cpe:2.3:a:apache:tomcat:10.1.32
  • Apache » Tomcat » Version: 10.1.33
    cpe:2.3:a:apache:tomcat:10.1.33
  • Apache » Tomcat » Version: 10.1.34
    cpe:2.3:a:apache:tomcat:10.1.34
  • Apache » Tomcat » Version: 10.1.35
    cpe:2.3:a:apache:tomcat:10.1.35
  • Apache » Tomcat » Version: 10.1.36
    cpe:2.3:a:apache:tomcat:10.1.36
  • Apache » Tomcat » Version: 10.1.37
    cpe:2.3:a:apache:tomcat:10.1.37
  • Apache » Tomcat » Version: 10.1.38
    cpe:2.3:a:apache:tomcat:10.1.38
  • Apache » Tomcat » Version: 10.1.39
    cpe:2.3:a:apache:tomcat:10.1.39
  • Apache » Tomcat » Version: 10.1.40
    cpe:2.3:a:apache:tomcat:10.1.40
  • Apache » Tomcat » Version: 10.1.41
    cpe:2.3:a:apache:tomcat:10.1.41
  • Apache » Tomcat » Version: 10.1.42
    cpe:2.3:a:apache:tomcat:10.1.42
  • Apache » Tomcat » Version: 10.1.43
    cpe:2.3:a:apache:tomcat:10.1.43
  • Apache » Tomcat » Version: 10.1.44
    cpe:2.3:a:apache:tomcat:10.1.44
  • Apache » Tomcat » Version: 10.1.45
    cpe:2.3:a:apache:tomcat:10.1.45
  • Apache » Tomcat » Version: 10.1.46
    cpe:2.3:a:apache:tomcat:10.1.46
  • Apache » Tomcat » Version: 10.1.47
    cpe:2.3:a:apache:tomcat:10.1.47
  • Apache » Tomcat » Version: 10.1.48
    cpe:2.3:a:apache:tomcat:10.1.48
  • Apache » Tomcat » Version: 10.1.49
    cpe:2.3:a:apache:tomcat:10.1.49
  • Apache » Tomcat » Version: 10.1.50
    cpe:2.3:a:apache:tomcat:10.1.50
  • Apache » Tomcat » Version: 10.1.51
    cpe:2.3:a:apache:tomcat:10.1.51
  • Apache » Tomcat » Version: 10.1.52
    cpe:2.3:a:apache:tomcat:10.1.52
  • Apache » Tomcat » Version: 10.1.53
    cpe:2.3:a:apache:tomcat:10.1.53
  • Apache » Tomcat » Version: 10.1.54
    cpe:2.3:a:apache:tomcat:10.1.54
  • Apache » Tomcat » Version: 10.1.55
    cpe:2.3:a:apache:tomcat:10.1.55
  • Apache » Tomcat » Version: 10.1.56
    cpe:2.3:a:apache:tomcat:10.1.56
  • Apache » Tomcat » Version: 10.1.57
    cpe:2.3:a:apache:tomcat:10.1.57
  • Apache » Tomcat » Version: 11.0.0
    cpe:2.3:a:apache:tomcat:11.0.0
  • Apache » Tomcat » Version: 11.0.1
    cpe:2.3:a:apache:tomcat:11.0.1
  • Apache » Tomcat » Version: 11.0.10
    cpe:2.3:a:apache:tomcat:11.0.10
  • Apache » Tomcat » Version: 11.0.11
    cpe:2.3:a:apache:tomcat:11.0.11
  • Apache » Tomcat » Version: 11.0.12
    cpe:2.3:a:apache:tomcat:11.0.12
  • Apache » Tomcat » Version: 11.0.13
    cpe:2.3:a:apache:tomcat:11.0.13
  • Apache » Tomcat » Version: 11.0.14
    cpe:2.3:a:apache:tomcat:11.0.14
  • Apache » Tomcat » Version: 11.0.15
    cpe:2.3:a:apache:tomcat:11.0.15
  • Apache » Tomcat » Version: 11.0.16
    cpe:2.3:a:apache:tomcat:11.0.16
  • Apache » Tomcat » Version: 11.0.17
    cpe:2.3:a:apache:tomcat:11.0.17
  • Apache » Tomcat » Version: 11.0.18
    cpe:2.3:a:apache:tomcat:11.0.18
  • Apache » Tomcat » Version: 11.0.2
    cpe:2.3:a:apache:tomcat:11.0.2
  • Apache » Tomcat » Version: 11.0.20
    cpe:2.3:a:apache:tomcat:11.0.20
  • Apache » Tomcat » Version: 11.0.21
    cpe:2.3:a:apache:tomcat:11.0.21
  • Apache » Tomcat » Version: 11.0.22
    cpe:2.3:a:apache:tomcat:11.0.22
  • Apache » Tomcat » Version: 11.0.23
    cpe:2.3:a:apache:tomcat:11.0.23
  • Apache » Tomcat » Version: 11.0.24
    cpe:2.3:a:apache:tomcat:11.0.24
  • Apache » Tomcat » Version: 11.0.3
    cpe:2.3:a:apache:tomcat:11.0.3
  • Apache » Tomcat » Version: 11.0.4
    cpe:2.3:a:apache:tomcat:11.0.4
  • Apache » Tomcat » Version: 11.0.5
    cpe:2.3:a:apache:tomcat:11.0.5
  • Apache » Tomcat » Version: 11.0.6
    cpe:2.3:a:apache:tomcat:11.0.6
  • Apache » Tomcat » Version: 11.0.7
    cpe:2.3:a:apache:tomcat:11.0.7
  • Apache » Tomcat » Version: 11.0.8
    cpe:2.3:a:apache:tomcat:11.0.8
  • Apache » Tomcat » Version: 11.0.9
    cpe:2.3:a:apache:tomcat:11.0.9
  • Apache » Tomcat » Version: 9.0.100
    cpe:2.3:a:apache:tomcat:9.0.100
  • Apache » Tomcat » Version: 9.0.101
    cpe:2.3:a:apache:tomcat:9.0.101
  • Apache » Tomcat » Version: 9.0.102
    cpe:2.3:a:apache:tomcat:9.0.102
  • Apache » Tomcat » Version: 9.0.103
    cpe:2.3:a:apache:tomcat:9.0.103
  • Apache » Tomcat » Version: 9.0.104
    cpe:2.3:a:apache:tomcat:9.0.104
  • Apache » Tomcat » Version: 9.0.105
    cpe:2.3:a:apache:tomcat:9.0.105
  • Apache » Tomcat » Version: 9.0.106
    cpe:2.3:a:apache:tomcat:9.0.106
  • Apache » Tomcat » Version: 9.0.107
    cpe:2.3:a:apache:tomcat:9.0.107
  • Apache » Tomcat » Version: 9.0.108
    cpe:2.3:a:apache:tomcat:9.0.108
  • Apache » Tomcat » Version: 9.0.109
    cpe:2.3:a:apache:tomcat:9.0.109
  • Apache » Tomcat » Version: 9.0.110
    cpe:2.3:a:apache:tomcat:9.0.110
  • Apache » Tomcat » Version: 9.0.111
    cpe:2.3:a:apache:tomcat:9.0.111
  • Apache » Tomcat » Version: 9.0.112
    cpe:2.3:a:apache:tomcat:9.0.112
  • Apache » Tomcat » Version: 9.0.113
    cpe:2.3:a:apache:tomcat:9.0.113
  • Apache » Tomcat » Version: 9.0.114
    cpe:2.3:a:apache:tomcat:9.0.114
  • Apache » Tomcat » Version: 9.0.115
    cpe:2.3:a:apache:tomcat:9.0.115
  • Apache » Tomcat » Version: 9.0.116
    cpe:2.3:a:apache:tomcat:9.0.116
  • Apache » Tomcat » Version: 9.0.117
    cpe:2.3:a:apache:tomcat:9.0.117
  • Apache » Tomcat » Version: 9.0.118
    cpe:2.3:a:apache:tomcat:9.0.118
  • Apache » Tomcat » Version: 9.0.119
    cpe:2.3:a:apache:tomcat:9.0.119
  • Apache » Tomcat » Version: 9.0.120
    cpe:2.3:a:apache:tomcat:9.0.120
  • Apache » Tomcat » Version: 9.0.89
    cpe:2.3:a:apache:tomcat:9.0.89
  • Apache » Tomcat » Version: 9.0.90
    cpe:2.3:a:apache:tomcat:9.0.90
  • Apache » Tomcat » Version: 9.0.91
    cpe:2.3:a:apache:tomcat:9.0.91
  • Apache » Tomcat » Version: 9.0.92
    cpe:2.3:a:apache:tomcat:9.0.92
  • Apache » Tomcat » Version: 9.0.93
    cpe:2.3:a:apache:tomcat:9.0.93
  • Apache » Tomcat » Version: 9.0.94
    cpe:2.3:a:apache:tomcat:9.0.94
  • Apache » Tomcat » Version: 9.0.95
    cpe:2.3:a:apache:tomcat:9.0.95
  • Apache » Tomcat » Version: 9.0.96
    cpe:2.3:a:apache:tomcat:9.0.96
  • Apache » Tomcat » Version: 9.0.97
    cpe:2.3:a:apache:tomcat:9.0.97
  • Apache » Tomcat » Version: 9.0.98
    cpe:2.3:a:apache:tomcat:9.0.98
  • Apache » Tomcat » Version: 9.0.99
    cpe:2.3:a:apache:tomcat:9.0.99


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