affected:
- package:
    ecosystem: PyPI
    name: django
    purl: pkg:pypi/django
  ranges:
  - events:
    - introduced: '4.2'
    - fixed: 4.2.26
    - introduced: '5.1'
    - fixed: 5.1.14
    - introduced: '5.2'
    - fixed: 5.2.8
    type: ECOSYSTEM
  versions:
  - '4.2'
  - 4.2.1
  - 4.2.10
  - 4.2.11
  - 4.2.12
  - 4.2.13
  - 4.2.14
  - 4.2.15
  - 4.2.16
  - 4.2.17
  - 4.2.18
  - 4.2.19
  - 4.2.2
  - 4.2.20
  - 4.2.21
  - 4.2.22
  - 4.2.23
  - 4.2.24
  - 4.2.25
  - 4.2.3
  - 4.2.4
  - 4.2.5
  - 4.2.6
  - 4.2.7
  - 4.2.8
  - 4.2.9
  - '5.1'
  - 5.1.1
  - 5.1.10
  - 5.1.11
  - 5.1.12
  - 5.1.13
  - 5.1.2
  - 5.1.3
  - 5.1.4
  - 5.1.5
  - 5.1.6
  - 5.1.7
  - 5.1.8
  - 5.1.9
  - '5.2'
  - 5.2.1
  - 5.2.2
  - 5.2.3
  - 5.2.4
  - 5.2.5
  - 5.2.6
  - 5.2.7
aliases:
- CVE-2025-64458
- GHSA-qw25-v68c-qjf3
details: |-
  An issue was discovered in 5.1 before 5.1.14, 4.2 before 4.2.26, and 5.2 before 5.2.8.
  NFKC normalization in Python is slow on Windows. As a consequence, `django.http.HttpResponseRedirect`, `django.http.HttpResponsePermanentRedirect`, and the shortcut `django.shortcuts.redirect`  were subject to a potential  denial-of-service attack via certain inputs with a very large number of Unicode characters.
  Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.
  Django would like to thank Seokchan Yoon for reporting this issue.
id: PYSEC-2025-107
modified: '2026-05-20T09:18:57.616972Z'
published: '2025-11-05T15:15:40.940Z'
references:
- type: ADVISORY
  url: https://docs.djangoproject.com/en/dev/releases/security/
- type: ADVISORY
  url: https://www.djangoproject.com/weblog/2025/nov/05/security-releases/
- type: ARTICLE
  url: https://groups.google.com/g/django-announce
- type: ADVISORY
  url: https://github.com/advisories/GHSA-qw25-v68c-qjf3
severity:
- score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  type: CVSS_V3