Django security releases issued: 5.1.8 and 5.0.14
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.
