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Date: Wed, 1 Feb 2023 12:00:48 +0100
From: Mariusz Felisiak <>
Subject: Django: CVE-2023-23969: Potential denial-of-service via
 Accept-Language headers.

In accordance with `our security release policy
<>`_, the 
Django team
is issuing
`Django 4.1.6 <>`_,
`Django 4.0.9 <>`_, and
`Django 3.2.17 <>`_.
These releases addresses the security issue detailed below. We encourage all
users of Django to upgrade as soon as possible.

CVE-2023-23969: Potential denial-of-service via ``Accept-Language`` headers

The parsed values of ``Accept-Language`` headers are cached in order to 
repetitive parsing. This leads to a potential denial-of-service vector via
excessive memory usage if large header values are sent.

In order to avoid this vulnerability, the ``Accept-Language`` header is now
parsed up to a maximum length.

Thanks to Nick Pope for the report and patch.

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

Affected supported versions

* Django main branch
* Django 4.2 (currently at pre-release alpha status)
* Django 4.1
* Django 4.0
* Django 3.2


Patches to resolve the issue have been applied to Django's main branch 
and the
4.2, 4.1, 4.0, and 3.2 release branches. The patches may be obtained 
from the
following changesets:

* On the `main branch 
* On the `4.2 release branch 
* On the `4.1 release branch 
* On the `4.0 release branch 
* On the `3.2 release branch 

The following releases have been issued:

* Django 4.1.6 (`download Django 4.1.6 
<>`_ | 
`4.1.6 checksums 
* Django 4.0.9 (`download Django 4.0.9 
<>`_ | 
`4.0.9 checksums 
* Django 3.2.17 (`download Django 3.2.17 
<>`_ | 
`3.2.17 checksums 

The PGP key ID used for this release is Mariusz Felisiak: 
`2EF56372BA48CD1B <>`_.

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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