CVE-2026-66299Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example.
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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
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-400
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Aug 27, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
apache tomcat apache:tomcat | from 9.0.89 before 9.0.121; from 10.1.24 before 10.1.58; from 11.0.1 before 11.0.25; 11.0.0; 11.0.0; 11.0.0; 11.0.0; 11.0.0; and 2 more ranges | NVD |
References
- https://lists.apache.org/thread/8owczcc1o8qw1rxmg9gvfk4w2jnh4l5kmailing-list, vendor-advisory
- http://www.openwall.com/lists/oss-security/2026/07/28/25mailing-list, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.