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 pre-loaded 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).