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USN-4378-1: Flask vulnerability

1 June 2020

Flask could be made to consume a large amount of memory if it received a specially crafted input.



  • flask - Micro web framework based on Werkzeug and Jinja2


It was discovered that Flask incorrectly handled certain inputs.
An attacker could possibly use this issue to cause a denial of service.

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

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