The default configuration for the file upload handling system in Django before 1.4.14, 1.5.x before 1.5.9, 1.6.x before 1.6.6, and 1.7 before release candidate 3 uses a sequential file name generation process when a file with a conflicting name is uploaded, which allows remote attackers to cause a denial of service (CPU consumption) by unloading a multiple files with the same name.
https://www.djangoproject.com/weblog/2014/aug/20/security/
http://www.debian.org/security/2014/dsa-3010
http://secunia.com/advisories/61281
http://secunia.com/advisories/61276
http://secunia.com/advisories/59782
http://lists.opensuse.org/opensuse-updates/2014-09/msg00023.html