Django security releases issued: 3.2.2, 3.1.10, and 2.2.22

Posted by Mariusz Felisiak on May 6, 2021

In accordance with our security release policy, the Django team is issuing Django 3.2.2, Django 3.1.10, and Django 2.2.22. These releases address the security issue with severity "moderate" detailed below. We encourage all users of Django to upgrade as soon as possible.

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.

Affected supported versions

  • Django main branch
  • Django 3.2
  • Django 3.1
  • Django 2.2


Patches to resolve the issue have been applied to Django's main branch and to the 3.2, 3.1, and 2.2 release branches. The patches may be obtained from the following changesets:

The following releases have been issued:

The PGP key ID used for this release is Mariusz Felisiak: 2EF56372BA48CD1B.

General notes regarding security reporting

As always, we ask that potential security issues be reported via private email to, and not via Django's Trac instance or the django-developers list. Please see our security policies for further information.

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