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                            CERT-Renater

                Note d'Information No. 2025/VULN196

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DATE                : 03/04/2025

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Django versions prior to
                                 5.1.8, 5.0.14.

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https://www.djangoproject.com/weblog/2025/apr/02/security-releases/
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Django security releases issued: 5.1.8 and 5.0.14
Posted by Sarah Boyce on 2 avril 2025

In accordance with our security release policy, the Django team is
issuing releases for Django 5.1.8 and Django 5.0.14. These releases
address the security issues detailed below. We encourage all users
of Django to upgrade as soon as possible.

CVE-2025-27556: Potential denial-of-service vulnerability in
LoginView, LogoutView, and set_language() on Windows

Python's NFKC normalization is slow on Windows. As a consequence,
django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView,
and django.views.i18n.set_language were subject to a potential
denial-of-service attack via certain inputs with a very large
number of Unicode characters.

Thanks to sw0rd1ight for the report.

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


Affected supported versions

    Django main
    Django 5.2 (currently at release candidate status)
    Django 5.1
    Django 5.0


Resolution

Patches to resolve the issue have been applied to Django's main, 5.2
(currently at release candidate status), 5.1, and 5.0 branches. The
patches may be obtained from the following changesets.

CVE-2025-27556: Potential denial-of-service vulnerability in
LoginView, LogoutView, and set_language() on Windows

    On the main branch
    On the 5.2 branch
    On the 5.1 branch
    On the 5.0 branch

The following releases have been issued

    Django 5.1.8 (download Django 5.1.8 | 5.1.8 checksums)
    Django 5.0.14 (download Django 5.0.14 | 5.0.14 checksums)

The PGP key ID used for this release is : 3955B19851EA96EF
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, nor via the Django Forum. Please see our security
policies for further information.


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