Algorithmic complexity vulnerability in the forms library in Django 1.0 before 1.0.4 and 1.1 before 1.1.1 allows remote attackers to cause a denial of service (CPU consumption) via a crafted (1) EmailField (email address) or (2) URLField (URL) that triggers a large amount of backtracking in a regular expression.
bugs.debian.org/cgi-bin/bugreport.cgi?bug=550457
groups.google.com/group/django-users/browse_thread/thread/15df9e45118dfc51
www.debian.org/security/2009/dsa-1905
www.djangoproject.com/weblog/2009/oct/09/security
www.openwall.com/lists/oss-security/2009/10/13/6
exchange.xforce.ibmcloud.com/vulnerabilities/53727
github.com/django/django
nvd.nist.gov/vuln/detail/CVE-2009-3695
web.archive.org/web/20200228171918/www.securityfocus.com/bid/36655