Django 4.0.2 release notes#

February 1, 2022

Django 4.0.2 fixes two security issues with severity “medium” and several bugs in 4.0.1. Also, the latest string translations from Transifex are incorporated, with a special mention for Bulgarian (fully translated).

CVE-2022-22818: Possible XSS via {% debug %} template tag#

The {% debug %} template tag didn’t properly encode the current context, posing an XSS attack vector.

In order to avoid this vulnerability, {% debug %} no longer outputs information when the DEBUG setting is False, and it ensures all context variables are correctly escaped when the DEBUG setting is True.

CVE-2022-23833: Denial-of-service possibility in file uploads#

Passing certain inputs to multipart forms could result in an infinite loop when parsing files.

Bugfixes#

  • Fixed a bug in Django 4.0 where TestCase.captureOnCommitCallbacks() could execute callbacks multiple times (#33410).

  • Fixed a regression in Django 4.0 where help_text was HTML-escaped in automatically-generated forms (#33419).

  • Fixed a regression in Django 4.0 that caused displaying an incorrect name for class-based views on the technical 404 debug page (#33425).

  • Fixed a regression in Django 4.0 that caused an incorrect repr of ResolverMatch for class-based views (#33426).

  • Fixed a regression in Django 4.0 that caused a crash of makemigrations on models without Meta.order_with_respect_to but with a field named _order (#33449).

  • Fixed a regression in Django 4.0 that caused incorrect ModelAdmin.radio_fields layout in the admin (#33407).

  • Fixed a duplicate operation regression in Django 4.0 that caused a migration crash when altering a primary key type for a concrete parent model referenced by a foreign key (#33462).

  • Fixed a bug in Django 4.0 that caused a crash of QuerySet.aggregate() after annotate() on an aggregate function with a default (#33468).

  • Fixed a regression in Django 4.0 that caused a crash of makemigrations when renaming a field of a renamed model (#33480).