==========================
Django 6.0.4 release notes
==========================

*April 7, 2026*

Django 6.0.4 fixes one security issue with severity "moderate", four security
issues with severity "low", and several bugs in 6.0.3.

CVE-2026-3902: ASGI header spoofing via underscore/hyphen conflation
====================================================================

``ASGIRequest`` normalizes header names following WSGI conventions, mapping
hyphens to underscores. As a result, even in configurations where reverse
proxies carefully strip security-sensitive headers named with hyphens, such a
header could be spoofed by supplying a header named with underscores.

Under WSGI, it is the responsibility of the server or proxy to avoid ambiguous
mappings. (Django's :djadmin:`runserver` was patched in :cve:`2015-0219`.) But
under ASGI, there is not the same uniform expectation, even if many proxies
protect against this under default configuration (including ``nginx`` via
``underscores_in_headers off;``).

Headers containing underscores are now ignored by ``ASGIRequest``, matching the
behavior of :pypi:`Daphne <daphne>`, the reference server for ASGI.

This issue has severity "low" according to the :ref:`Django security policy
<severity-levels>`.

CVE-2026-4277: Privilege abuse in ``GenericInlineModelAdmin``
=============================================================

Add permissions on inline model instances were not validated on submission of
forged ``POST`` data in
:class:`~django.contrib.contenttypes.admin.GenericInlineModelAdmin`.

This issue has severity "low" according to the :ref:`Django security policy
<severity-levels>`.

CVE-2026-4292: Privilege abuse in ``ModelAdmin.list_editable``
==============================================================

Admin changelist forms using
:attr:`~django.contrib.admin.ModelAdmin.list_editable` incorrectly allowed new
instances to be created via forged ``POST`` data.

This issue has severity "low" according to the :ref:`Django security policy
<severity-levels>`.

CVE-2026-33033: Potential denial-of-service vulnerability in ``MultiPartParser`` via base64-encoded file upload
===============================================================================================================

When using ``django.http.multipartparser.MultiPartParser``, multipart uploads
with ``Content-Transfer-Encoding: base64`` that include excessive whitespace
may trigger repeated memory copying, potentially degrading performance.

This issue has severity "moderate" according to the :ref:`Django security
policy <severity-levels>`.

CVE-2026-33034: Potential denial-of-service vulnerability in ASGI requests via memory upload limit bypass
=========================================================================================================

ASGI requests with a missing or understated ``Content-Length`` header could
bypass the :setting:`DATA_UPLOAD_MAX_MEMORY_SIZE` limit when reading
``HttpRequest.body``, potentially loading an unbounded request body into
memory and causing service degradation.

This issue has severity "low" according to the :ref:`Django security policy
<severity-levels>`.

Bugfixes
========

* Fixed a regression in Django 6.0 where :func:`~django.contrib.auth.alogin`
  and :func:`~django.contrib.auth.alogout` did not respectively set or clear
  ``request.user`` if it had already been materialized (e.g., by sync
  middleware) (:ticket:`37017`).

* Fixed a regression in Django 6.0 in admin forms where
  ``RelatedFieldWidgetWrapper`` incorrectly wrapped all widgets in a
  ``<fieldset>`` (:ticket:`36949`).

* Fixed a bug in Django 6.0 where the ``fields.E348`` system check did not
  detect name clashes between model managers and
  :attr:`~django.db.models.ForeignKey.related_name`\s for non-self-referential
  relationships (:ticket:`36973`).
