=========================== Django 2.2.22 release notes =========================== *May 6, 2021* Django 2.2.22 fixes a security issue in 2.2.21. CVE-2021-32052: Header injection possibility since ``URLValidator`` accepted newlines in input on Python 3.9.5+ =============================================================================================================== On Python 3.9.5+, :class:`~django.core.validators.URLValidator` didn't prohibit newlines and tabs. If you used values with newlines in HTTP response, you could suffer from header injection attacks. Django itself wasn't vulnerable because :class:`~django.http.HttpResponse` prohibits newlines in HTTP headers. Moreover, the ``URLField`` form field which uses ``URLValidator`` silently removes newlines and tabs on Python 3.9.5+, so the possibility of newlines entering your data only existed if you are using this validator outside of the form fields. This issue was introduced by the :bpo:`43882` fix.