# Django 4.2.9.dev20231204082947 - dokumentacja

# 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+, `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.