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5.8 Medium

CVE-2025-27556 An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14

Description

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 and versions

Product Affected versions Fixed in
Django 5.1 5.1 → < 5.1.8 5.1.8
Django 5.0 5.0 → < 5.0.14 5.0.14

Other CVEs of Django

The 62 CVEs of Django →
CVE-2026-114582 An issue was discovered in Django 6.1 before 6.1.3, 6.0 before 6.0.10, and 5.2 before 5.2.19 5.3 Medium CVE-2026-113733 An issue was discovered in Django 6.1 before 6.1.3 and 6.0 before 6.0.10 2.2 Low CVE-2026-113593 An issue was discovered in Django 6.1 before 6.1.3, 6.0 before 6.0.10, and 5.2 before 5.2.19 3.1 Low CVE-2026-111362 An issue was discovered in Django 6.1 before 6.1.3, 6.0 before 6.0.10, and 5.2 before 5.2.19 5.3 Medium
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