The following flaw was found in Django:
'django.core.validators.URLValidator' included a regular expression that was extremely slow to evaluate against certain invalid inputs. This regular expression has been simplified and optimized.
This flaw has been fixed in Django version 1.8.3.
Red Hat would like to thank the upstream Django project for reporting this issue.
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This is now public: https://www.djangoproject.com/weblog/2015/jul/08/security-releases/
python-django-1.8.3-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.