Fluid Attacks Database

Description

Django Potential Denial of Service (DoS) on Windows 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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Package	Affected version	Patched versions
pypi	django	>=5.0 <5.0.14 \|\| >=5.1 <5.1.8	5.0.14, 5.1.8

Aliases

1. CVE-2025-275562. NVD-2025-275563. OSV-2025-275564. GCVE-2025-27556

References

1. https://github.com/django/django/commit/2cb311f7b069723027fb5def4044d1816d7d2afd2. https://github.com/django/django/commit/39e2297210d9d2938c75fc911d45f0e863dc48213. https://github.com/django/django/commit/8c6871b097b6c49d2a782c0d80d908bcbe2116f14. https://github.com/django/django/commit/edc2716d01a6fdd84b173c02031695231bcee1f85. https://docs.djangoproject.com/en/dev/releases/security6. https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2025-14.yaml7. https://groups.google.com/g/django-announce8. https://www.djangoproject.com/weblog/2025/apr/02/security-releases9. http://www.openwall.com/lists/oss-security/2025/04/02/2