SB20260728136 - Remote denial of service in Apache Tomcat

Description

This security bulletin contains information about 1 vulnerability.

1) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-66299)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper resource management in the WebSocket chat example when buffering undelivered messages for a maliciously slow client connection. A remote attacker can maintain a slow client connection to cause a denial of service.

Only deployments exposing the example web application are vulnerable.

Remediation

Install update from vendor's website.

References

• https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.25
• https://github.com/apache/tomcat/commit/4e8e3f8964e9653bab427bf794e026c69ee80f2b
• https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.58