The authentication framework (django.contrib.auth) in Django 1.4.x before 1.4.8, 1.5.x before 1.5.4, and 1.6.x before 1.6 beta 4 allows remote attackers to cause a denial of service (CPU consumption) via a long password which is then hashed.
"https://github.com/pypa/advisory-database/blob/main/vulns/django/PYSEC-2013-18.yaml"