pysec-2025-14
Vulnerability from pysec
Published
2025-04-02 13:15
Modified
2025-04-09 17:27
Details

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.

Impacted products
Name purl
django pkg:pypi/django
Aliases


To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "django",
        "purl": "pkg:pypi/django"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.1"
            },
            {
              "fixed": "5.1.8"
            },
            {
              "introduced": "5.0"
            },
            {
              "fixed": "5.0.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.0",
        "5.0.1",
        "5.0.10",
        "5.0.11",
        "5.0.12",
        "5.0.13",
        "5.0.2",
        "5.0.3",
        "5.0.4",
        "5.0.5",
        "5.0.6",
        "5.0.7",
        "5.0.8",
        "5.0.9",
        "5.1",
        "5.1.1",
        "5.1.2",
        "5.1.3",
        "5.1.4",
        "5.1.5",
        "5.1.6",
        "5.1.7"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-27556"
  ],
  "details": "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.",
  "id": "PYSEC-2025-14",
  "modified": "2025-04-09T17:27:25.169049+00:00",
  "published": "2025-04-02T13:15:44+00:00",
  "references": [
    {
      "type": "ARTICLE",
      "url": "https://www.djangoproject.com/weblog/2025/apr/02/security-releases/"
    },
    {
      "type": "WEB",
      "url": "https://docs.djangoproject.com/en/dev/releases/security/"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/django-announce"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2025/04/02/2"
    }
  ]
}


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