May 6, 2021
Django 2.2.22 fixes a security issue in 2.2.21.
URLValidator
accepted newlines in input on Python 3.9.5+¶On Python 3.9.5+, 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
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.
Sep 03, 2024