==========================================================================
Ubuntu Security Notice USN-7547-1
June 02, 2025

python-tornado vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04
- Ubuntu 24.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Tornado could be made to consume excessive resources when processing
specially crafted HTTP requests.

Software Description:
- python-tornado: scalable, non-blocking web server and tools

Details:

It was discovered that Tornado inefficiently handled requests when
parsing certain form data. An attacker could possibly use this issue to
increase resource utilization leading to a denial of service. This issue
was only addressed in Ubuntu 24.04 LTS and Ubuntu 22.04 LTS.
(CVE-2025-47287)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.04
  python3-tornado                 6.4.2-1ubuntu0.25.04.1

Ubuntu 24.10
  python3-tornado                 6.4.1-2ubuntu0.2

Ubuntu 24.04 LTS
  python3-tornado                 6.4.0-1ubuntu0.2

Ubuntu 22.04 LTS
  python3-tornado                 6.1.0-3ubuntu0.1~esm2
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-7547-1
  CVE-2025-47287

Package Information:
  https://launchpad.net/ubuntu/+source/python-tornado/6.4.2-1ubuntu0.25.04.1
  https://launchpad.net/ubuntu/+source/python-tornado/6.4.1-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/python-tornado/6.4.0-1ubuntu0.2