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.
History

Thu, 06 Nov 2025 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Djangoproject
Djangoproject django
Microsoft
Microsoft windows
Vendors & Products Djangoproject
Djangoproject django
Microsoft
Microsoft windows

Wed, 05 Nov 2025 17:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 05 Nov 2025 15:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Potential denial-of-service vulnerability in HttpResponseRedirect and HttpResponsePermanentRedirect on Windows
Weaknesses CWE-407
References

cve-icon MITRE

Status: PUBLISHED

Assigner: DSF

Published: 2025-11-05T15:07:17.031Z

Updated: 2025-11-05T16:20:57.265Z

Reserved: 2025-11-04T14:35:57.526Z

Link: CVE-2025-64458

cve-icon Vulnrichment

Updated: 2025-11-05T16:20:35.464Z

cve-icon NVD

Status : Received

Published: 2025-11-05T15:15:40.940

Modified: 2025-11-05T17:15:45.880

Link: CVE-2025-64458

cve-icon Redhat

No data.