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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:Apr 2, 2025
    Last Modified:Oct 3, 2025
    EPS:Apr 2, 2025
    EPSS Score:0.00019
    CVSS Score:5.8

    Affected Products

    Vendor
    Djangoproject
    Product
    Django
    Vendor
    Microsoft
    Product
    Windows

    Exploits

    No exploit reference

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High