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Date: Fri, 19 Feb 2021 10:17:05 +0100
From: Carlton Gibson <>
Subject: Django security releases: CVE-2021-23336: Web cache poisoning via


In accordance with `our security release policy
<>`_, the Django team
is issuing
`Django 3.1.7 <>`_,
`Django 3.0.13 <>`_, and
`Django 2.2.19 <>`_.
These release addresses the security issue detailed below. We encourage all users of Django to upgrade as soon as possible.

CVE-2021-23336: Web cache poisoning via ``django.utils.http.limited_parse_qsl()``

Django contains a copy of ``urllib.parse.parse_qsl()`` which was added to
backport some security fixes. A further security fix has been issued recently
such that ``parse_qsl()`` no longer allows using ``;`` as a query parameter
separator by default. Django now includes this fix. See `bpo-42967
<>`_ for further details.

This issue has moderate severity, according to the Django security policy.

Affected supported versions

* Django 3.2 (currently at beta status)
* Django 3.1
* Django 3.0
* Django 2.2


Patches to resolve the issue have been applied to the 3.2, 3.1, 3.0, and 2.2 release
branches. The patches may be obtained from the following changesets:

* On the `3.2 release branch <>`__
* On the `3.1 release branch <>`__
* On the `3.0 release branch <>`__
* On the `2.2 release branch <>`__

The following releases have been issued:

* Django 3.1.7 (`download Django 3.1.7 <>`_ | `3.1.7 checksums <>`_)
* Django 3.0.13 (`download Django 3.0.13 <>`_ | `3.0.13 checksums <>`_)
* Django 2.2.19 (`download Django 2.2.19 <>`_ | `2.2.19 checksums <>`_)

The PGP key ID used for these releases is Carlton Gibson: `E17DF5C82B4F9D00

Django 3.2 beta 1 will be released in a separate blog post later today.

General notes regarding security reporting

As always, we ask that potential security issues be reported via
private email to ````, and not via Django's
Trac instance or the django-developers list. Please see `our security
policies <>`_ for further

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