# documentación de Django - 5.1.7

# Django 3.1.1 release notes

September 1, 2020

Django 3.1.1 fixes two security issues and several bugs in 3.1.

## CVE-2020-24583: Incorrect permissions on intermediate-level directories on Python 3.7+

On Python 3.7+, `FILE_UPLOAD_DIRECTORY_PERMISSIONS` mode was not applied to intermediate-level directories created in the process of uploading files and to intermediate-level collected static directories when using the `collectstatic` management command.

You should review and manually fix permissions on existing intermediate-level directories.

## CVE-2020-24584: Permission escalation in intermediate-level directories of the file system cache on Python 3.7+

On Python 3.7+, the intermediate-level directories of the file system cache had the system’s standard umask rather than `0o077` (no group or others permissions).

## Bugfixes

- Fixed wrapping of translated action labels in the admin’s navigation sidebar for East Asian languages (#31853).

- Fixed wrapping of long model names in the admin’s navigation sidebar (#31854).

- Fixed encoding session data while upgrading multiple instances of the same project to Django 3.1 (#31864).

- Adjusted admin’s navigation sidebar template to reduce debug logging when rendering (#31865).

- Fixed a data loss possibility in the `select_for_update()`. When using related fields pointing to a proxy model in the `of` argument, the corresponding model was not locked (#31866).

- Fixed a data loss possibility, following a regression in Django 2.0, when copying model instances with a cached fields value (#31863).

- Fixed a regression in Django 3.1 that caused a crash when decoding an invalid session data (#31895).

- Reverted a deprecation in Django 3.1 that caused a crash when passing deprecated keyword arguments to a queryset in `TemplateView.get_context_data()` (#31877).

- Enforced thread sensitivity of the `MiddlewareMixin.process_request()` and `process_response()` hooks when in an async context (#31905).

- Fixed `__in` lookup on key transforms for `JSONField` with MariaDB, MySQL, Oracle, and SQLite (#31936).

- Fixed a regression in Django 3.1 that caused permission errors in `CommonPasswordValidator` and `settings.py` generated by the `startproject` command, when user didn’t have permissions to all intermediate directories in a Django installation path (#31912).

- Fixed detecting an async `get_response` callable in various builtin middlewares (#31928).

- Fixed a `QuerySet.order_by()` crash on PostgreSQL when ordering and grouping by `JSONField` with a custom `decoder` (#31956). As a consequence, fetching a `JSONField` with raw SQL now returns a string instead of preloaded data. You will need to explicitly call `json.loads()` in such cases.

- Fixed a `QuerySet.delete()` crash on MySQL, following a performance regression in Django 3.1 on MariaDB 10.3.2+, when filtering against an aggregate function (#31965).

- Fixed a `django.contrib.admin.EmptyFieldListFilter` crash when using on reverse relations (#31952).

- Prevented content overflowing in the admin changelist view when the navigation sidebar is enabled (#31901).