Debian Linux Security Advisory 1905-1 – The forms library of python-django, a high-level Python web development framework, is using a badly chosen regular expression when validating email addresses and URLs. An attacker can use this to perform denial of service attacks (100% CPU consumption) due to bad backtracking via a specially crafted email address or URL which is validated by the django forms library.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81934/dsa-1905-1.txt
Source: https://packetstormsecurity.com/files/81934/Debian-Linux-Security-Advisory-1905-1.html