PT-2026-65495 · Apache · Apache Tomcat

CVE-2026-66299 · Published 2026-07-28 · Updated 2026-07-28

Mitre

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-66299

Affected Products

Apache Tomcat

References · 3

• https://lists.apache.org/thread/8owczcc1o8qw1rxmg9gvfk4w2jnh4l5k · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-66299 · Security Note
• http://openwall.com/lists/oss-security/2026/07/28/25 · Note