Affected: Ubuntu:Pro:14.04:LTS: python-django, Ubuntu:Pro:16.04:LTS: python-django, Ubuntu:18.04:LTS: python-django, Ubuntu:20.04:LTS: python-django

An issue was discovered in Django 2.2 before 2.2.26, 3.2 before 3.2.11, and 4.0 before 4.0.1. UserAttributeSimilarityValidator incurred significant overhead in evaluating a submitted password that was artificially large in relation to the comparison values. In a situation where access to user registration was unrestricted, this provided a potential vector for a denial-of-service attack.