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Django 3.1.10 release notes

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*May 6, 2021*

Django 3.1.10 fixes a security issue in 3.1.9.

CVE-2021-32052: Header injection possibility since ``URLValidator`` accepted newlines in input on Python 3.9.5+

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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.