Vulnerability Monitor

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CVE-2025-27556

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.

Published

2025-04-02T13:15:44.373

Last Modified

2025-10-03T15:34:09.950

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 5.8 (MEDIUM)

Weaknesses

Type: Secondary
CWE-770

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	djangoproject	django	< 5.0.14	Yes
Application	djangoproject	django	< 5.1.8	Yes
Operating System	microsoft	windows	-	No

References

https://docs.djangoproject.com/en/dev/releases/security/ Vendor Advisory ([email protected])
https://groups.google.com/g/django-announce Vendor Advisory ([email protected])
https://www.djangoproject.com/weblog/2025/apr/02/security-releases/ Vendor Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2025/04/02/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)