[USN-7534-1] Flask vulnerability

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Ubuntu Security Notice USN-7534-1
May 26, 2025

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

- Ubuntu 25.04

Summary:

Flask could be made to sign sessions with stale keys.

Software Description:
- flask: Micro web framework based on Werkzeug and Jinja2

Details:

It was discovered that Flask incorrectly handled key rotation.
An attacker could possibly use this issue to sign sessions
with stale keys.

Update instructions:

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

Ubuntu 25.04
python3-flask 3.1.0-2ubuntu1.1

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

References:
https://ubuntu.com/security/notices/USN-7534-1
CVE-2025-47278

Package Information:
https://launchpad.net/ubuntu/+source/flask/3.1.0-2ubuntu1.1