The form library in Django 1.3.x before 1.3.6, 1.4.x before 1.4.4, and 1.5 before release candidate 2 allows remote attackers to bypass intended resource limits for formsets and cause a denial of service (memory consumption) or trigger server errors via a modified max_num parameter.
rhn.redhat.com/errata/RHSA-2013-0670.html
ubuntu.com/usn/usn-1757-1
www.debian.org/security/2013/dsa-2634
github.com/django/django
github.com/django/django/commit/0cc350a896f70ace18280410eb616a9197d862b0
github.com/django/django/commit/d7094bbce8cb838f3b40f504f198c098ff1cf727
nvd.nist.gov/vuln/detail/CVE-2013-0306
www.djangoproject.com/weblog/2013/feb/19/security