django/docs/releases/5.0.7.txt

==========================
Django 5.0.7 release notes
==========================

*July 9, 2024*

Django 5.0.7 fixes two security issues with severity "moderate", two security
issues with severity "low", and one bug in 5.0.6.

CVE-2024-38875: Potential denial-of-service vulnerability in ``django.utils.html.urlize()``
===========================================================================================

:tfilter:`urlize` and :tfilter:`urlizetrunc` were subject to a potential
denial-of-service attack via certain inputs with a very large number of
brackets.

CVE-2024-39329: Username enumeration through timing difference for users with unusable passwords
================================================================================================

The :meth:`~django.contrib.auth.backends.ModelBackend.authenticate()` method
allowed remote attackers to enumerate users via a timing attack involving login
requests for users with unusable passwords.

CVE-2024-39330: Potential directory-traversal via ``Storage.save()``
====================================================================

Derived classes of the :class:`~django.core.files.storage.Storage` base class
which override :meth:`generate_filename()
<django.core.files.storage.Storage.generate_filename()>` without replicating
the file path validations existing in the parent class, allowed for potential
directory-traversal via certain inputs when calling :meth:`save()
<django.core.files.storage.Storage.save()>`.

Built-in ``Storage`` sub-classes were not affected by this vulnerability.

CVE-2024-39614: Potential denial-of-service vulnerability in ``get_supported_language_variant()``
=================================================================================================

:meth:`~django.utils.translation.get_supported_language_variant` was subject to
a potential denial-of-service attack when used with very long strings
containing specific characters.

To mitigate this vulnerability, the language code provided to
:meth:`~django.utils.translation.get_supported_language_variant` is now parsed
up to a maximum length of 500 characters.

When the language code is over 500 characters, a :exc:`ValueError` will now be
raised if ``strict`` is ``True``, or if there is no generic variant and
``strict`` is ``False``.

Bugfixes
========

* Fixed a bug in Django 5.0 that caused a crash of ``Model.full_clean()`` on
  unsaved model instances with a ``GeneratedField`` and certain defined
  :attr:`Meta.constraints <django.db.models.Options.constraints>`
  (:ticket:`35560`).