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Ubuntu 25.04 USN-7534-1 critical: Flask session signing with outdated keys

ubuntu
Calendar Grey May 26, 2025
Dist Ubuntu Esm H88
Keep updated with Ubuntu Security Notice USN-7534-2 concerning Flask session signing using deprecated keys.
Flask could be made to sign sessions with stale keys.

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.

Topics%20covered

Topics Covered

security advisory Ubuntu flask session signing stale keys key rotation

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7534-1

Topics%20covered

Topics Covered

security advisory Ubuntu flask session signing stale keys key rotation

Package Information

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

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