# Django 5.2.17 documentation

# 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).