# Django 5.2.9 documentation

# Django 4.1.2 release notes

October 4, 2022

Django 4.1.2 fixes a security issue with severity “medium” and several bugs in 4.1.1.

## CVE-2022-41323: Potential denial-of-service vulnerability in internationalized URLs

Internationalized URLs were subject to potential denial of service attack via the locale parameter.

## Bugfixes

- Fixed a regression in Django 4.1 that caused a migration crash on PostgreSQL when adding a model with `ExclusionConstraint` (#33982).

- Fixed a regression in Django 4.1 that caused aggregation over a queryset that contained an `Exists` annotation to crash due to too many selected columns (#33992).

- Fixed a bug in Django 4.1 that caused an incorrect validation of `CheckConstraint` on `NULL` values (#33996).

- Fixed a regression in Django 4.1 that caused a `QuerySet.values()/values_list()` crash on `ArrayAgg()` and `JSONBAgg()` (#34016).

- Fixed a bug in Django 4.1 that caused `ModelAdmin.autocomplete_fields` to be incorrectly selected after adding/changing related instances via popups (#34025).

- Fixed a regression in Django 4.1 where the app registry was not populated when running parallel tests with the `multiprocessing` start method `spawn` (#34010).

- Fixed a regression in Django 4.1 where the `--debug-mode` argument to `test` did not work when running parallel tests with the `multiprocessing` start method `spawn` (#34010).

- Fixed a regression in Django 4.1 that didn’t alter a sequence type when altering type of pre-Django 4.1 serial columns on PostgreSQL (#34058).

- Fixed a regression in Django 4.1 that caused a crash for `View` subclasses with asynchronous handlers when handling non-allowed HTTP methods (#34062).

- Reverted caching related managers for `ForeignKey`, `ManyToManyField`, and `GenericRelation` that caused the incorrect refreshing of related objects (#33984).

- Relaxed the system check added in Django 4.1 for the same name used for multiple template tag modules to a warning (#32987).