# Django 3.0.9.dev - dokumentacja

# Django 3.0.3 release notes

February 3, 2020

Django 3.0.3 fixes a security issue and several bugs in 3.0.2.

## CVE-2020-7471: Potential SQL injection via `StringAgg(delimiter)`

`StringAgg` aggregation function was subject to SQL injection, using a suitably crafted `delimiter`.

## Poprawki błędów

- Fixed a regression in Django 3.0 that caused a crash when subtracting `DateField`, `DateTimeField`, or `TimeField` from a `Subquery()` annotation (#31133).
- Fixed a regression in Django 3.0 where `QuerySet.values()` and `values_list()` crashed if a queryset contained an aggregation and `Exists()` annotation (#31136).
- Relaxed the system check added in Django 3.0 to reallow use of a sublanguage in the `LANGUAGE_CODE` setting, when a base language is available in Django but the sublanguage is not (#31141).
- Added support for using enumeration types `TextChoices`, `IntegerChoices`, and `Choices` in templates (#31154).
- Fixed a system check to ensure the `max_length` attribute fits the longest choice, when a named group contains only non-string values (#31155).
- Fixed a regression in Django 2.2 that caused a crash of `ArrayAgg` and `StringAgg` with `filter` argument when used in a `Subquery` (#31097).
- Fixed a regression in Django 2.2.7 that caused `get_FOO_display()` to work incorrectly when overriding inherited choices (#31124).
- Fixed a regression in Django 3.0 that caused a crash of `QuerySet.prefetch_related()` for `GenericForeignKey` with a custom `ContentType` foreign key (#31190).