CVE-2025-27556
Django Potential Denial of Service (DoS) on Windows
5.8
MEDIUM
CVSS 3.1
EPSS 0.01%
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.
How to fix CVE-2025-27556
To remediate CVE-2025-27556, upgrade the affected package to a fixed version below.
- —upgrade to 5.0.14 or later
- —upgrade to 5.0.14 or later
- —upgrade to 5.1.8 or later
Is CVE-2025-27556 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- >= 5.0.0, < 5.0.14, >= 5.1.0, < 5.1.8
- >= 5.0, < 5.0.14
- >= 5.1, < 5.1.8, >= 5.0, < 5.0.14
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L |