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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-27556US | high7.5 | — | ||
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.c… | ||||
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references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2025/04/02/2WEB
- https://docs.djangoproject.com/en/dev/releases/securityWEB
- https://github.com/django/djangoPACKAGE
- https://github.com/django/django/commit/2cb311f7b069723027fb5def4044d1816d7d2afdWEB
- https://github.com/django/django/commit/39e2297210d9d2938c75fc911d45f0e863dc4821WEB
- https://github.com/django/django/commit/8c6871b097b6c49d2a782c0d80d908bcbe2116f1WEB
- https://github.com/django/django/commit/edc2716d01a6fdd84b173c02031695231bcee1f8WEB
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2025-14.yamlWEB
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