CVE-2025-27556: Djangoproject Django

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The 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 are subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters.

Affected products

• Djangoproject Django: from 5.0, before 5.0.14 (fixed in 5.0.14); from 5.1, before 5.1.8 (fixed in 5.1.8)

Published 2025-04-02. Last modified 2026-06-17.