===========================
Django 5.2.13 release notes
===========================

*April 7, 2026*

Django 5.2.13 fixes one security issue with severity "moderate" and four
security issues with severity "low" in 5.2.12.

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
<security-disclosure>`.

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
<security-disclosure>`.

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
<security-disclosure>`.

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 <security-disclosure>`.

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
<security-disclosure>`.