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django/docs/releases/4.2.1.txt
Mariusz Felisiak fb4c55d9ec Fixed CVE-2023-31047, Fixed #31710 -- Prevented potential bypass of validation when uploading multiple files using one form field.
Thanks Moataz Al-Sharida and nawaik for reports.

Co-authored-by: Shai Berger <shai@platonix.com>
Co-authored-by: nessita <124304+nessita@users.noreply.github.com>
2023-05-03 13:42:00 +02:00

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==========================
Django 4.2.1 release notes
==========================
*May 3, 2023*
Django 4.2.1 fixes a security issue with severity "low" and several bugs in
4.2.
CVE-2023-31047: Potential bypass of validation when uploading multiple files using one form field
=================================================================================================
Uploading multiple files using one form field has never been supported by
:class:`.forms.FileField` or :class:`.forms.ImageField` as only the last
uploaded file was validated. Unfortunately, :ref:`uploading_multiple_files`
topic suggested otherwise.
In order to avoid the vulnerability, :class:`~django.forms.ClearableFileInput`
and :class:`~django.forms.FileInput` form widgets now raise ``ValueError`` when
the ``multiple`` HTML attribute is set on them. To prevent the exception and
keep the old behavior, set ``allow_multiple_selected`` to ``True``.
For more details on using the new attribute and handling of multiple files
through a single field, see :ref:`uploading_multiple_files`.
Bugfixes
========
* Fixed a regression in Django 4.2 that caused a crash of ``QuerySet.defer()``
when deferring fields by attribute names (:ticket:`34458`).
* Fixed a regression in Django 4.2 that caused a crash of
:class:`~django.contrib.postgres.search.SearchVector` function with ``%``
characters (:ticket:`34459`).
* Fixed a regression in Django 4.2 that caused aggregation over query that
uses explicit grouping to group against the wrong columns (:ticket:`34464`).
* Reallowed, following a regression in Django 4.2, setting the
``"cursor_factory"`` option in :setting:`OPTIONS` on PostgreSQL
(:ticket:`34466`).
* Enforced UTF-8 client encoding on PostgreSQL, following a regression in
Django 4.2 (:ticket:`34470`).
* Fixed a regression in Django 4.2 where ``i18n_patterns()`` didn't respect the
``prefix_default_language`` argument when a fallback language of the default
language was used (:ticket:`34455`).
* Fixed a regression in Django 4.2 where translated URLs of the default
language from ``i18n_patterns()`` with ``prefix_default_language`` set to
``False`` raised 404 errors for a request with a different language
(:ticket:`34515`).
* Fixed a regression in Django 4.2 where creating copies and deep copies of
``HttpRequest``, ``HttpResponse``, and their subclasses didn't always work
correctly (:ticket:`34482`, :ticket:`34484`).
* Fixed a regression in Django 4.2 where ``timesince`` and ``timeuntil``
template filters returned incorrect results for a datetime with a non-UTC
timezone when a time difference is less than 1 day (:ticket:`34483`).
* Fixed a regression in Django 4.2 that caused a crash of
:class:`~django.contrib.postgres.search.SearchHeadline` function with
``psycopg`` 3 (:ticket:`34486`).
* Fixed a regression in Django 4.2 that caused incorrect ``ClearableFileInput``
margins in the admin (:ticket:`34506`).
* Fixed a regression in Django 4.2 where breadcrumbs didn't appear on admin
site app index views (:ticket:`34512`).
* Made squashing migrations reduce ``AddIndex``, ``RemoveIndex``,
``RenameIndex``, and ``CreateModel`` operations which allows removing a
deprecated ``Meta.index_together`` option from historical migrations and use
``Meta.indexes`` instead (:ticket:`34525`).