CVE-2026-77791
Apache Tomcat: DoS via busy wait during WebSocket close
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack. This issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.74 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.88 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
| CWE | CWE-400 |
| Vendor | apache software foundation |
| Product | apache tomcat |
| Published | Sep 23, 2026 |
| Last Updated | Sep 23, 2026 |
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Affected Versions
Apache Software Foundation / Apache Tomcat
11.0.0-M5 ≤ 11.0.25 10.1.8 ≤ 10.1.59 9.0.74 ≤ 9.0.121 8.5.88 ≤ 8.5.100