Django: CVE-2023-36053: Potential regular expression denial of service vulnerability in EmailValidator/URLValidator

[Mariusz Felisiak <felisiak.mariusz () gmail com>]

https://www.djangoproject.com/weblog/2023/jul/03/security-releases/

In accordance with `our security release policy
<https://docs.djangoproject.com/en/dev/internals/security/>`_, the 
Django team
is issuing
`Django 4.2.3 <https://docs.djangoproject.com/en/dev/releases/4.2.3/>`_,
`Django 4.1.10 
<https://docs.djangoproject.com/en/dev/releases/4.1.10/>`_, and
`Django 3.2.20 <https://docs.djangoproject.com/en/dev/releases/3.2.20/>`_.
These releases addresses the security issue detailed below. We encourage all
users of Django to upgrade as soon as possible.

CVE-2023-36053: Potential regular expression denial of service 
vulnerability in ``EmailValidator``/``URLValidator``
===================================================================================================================

``EmailValidator`` and ``URLValidator`` were subject to potential regular
expression denial of service attack via a very large number of domain name
labels of emails and URLs.

Thanks Seokchan Yoon for reports.

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

Affected supported versions
===========================

* Django main branch
* Django 4.2
* Django 4.1
* Django 3.2

Resolution
==========

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

* On the `main branch 
<https://github.com/django/django/commit/ad0410ec4f458aa39803e5f6b9a3736527062dcd>`__
* On the `4.2 release branch 
<https://github.com/django/django/commit/b7c5feb35a31799de6e582ad6a5a91a9de74e0f9>`__
* On the `4.1 release branch 
<https://github.com/django/django/commit/beb3f3d55940d9aa7198bf9d424ab74e873aec3d>`__
* On the `3.2 release branch 
<https://github.com/django/django/commit/454f2fb93437f98917283336201b4048293f7582>`__

The following releases have been issued:

* Django 4.2.3 (`download Django 4.2.3 
<https://www.djangoproject.com/m/releases/4.2/Django-4.2.3.tar.gz>`_ | 
`4.2.3 checksums 
<https://www.djangoproject.com/m/pgp/Django-4.2.3.checksum.txt>`_)
* Django 4.1.10 (`download Django 4.1.10 
<https://www.djangoproject.com/m/releases/4.1/Django-4.1.10.tar.gz>`_ | 
`4.1.10 checksums 
<https://www.djangoproject.com/m/pgp/Django-4.1.10.checksum.txt>`_)
* Django 3.2.20 (`download Django 3.2.20 
<https://www.djangoproject.com/m/releases/3.2/Django-3.2.20.tar.gz>`_ | 
`3.2.20 checksums 
<https://www.djangoproject.com/m/pgp/Django-3.2.20.checksum.txt>`_)

The PGP key ID used for this release is Mariusz Felisiak: 
`2EF56372BA48CD1B <https://github.com/felixxm.gpg>`_.

General notes regarding security reporting
==========================================

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