CVE-2025-64458

Potential denial-of-service vulnerability in HttpResponseRedirect and HttpResponsePermanentRedirect on Windows

State: Published
Severity: 7.5 High
Published: Nov 5, 2025
Updated: Nov 5, 2025
Reserved: Nov 4, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
Djangodjangoproject	5.2 to before 5.2.8Affected 5.2.8Not affected 5.1 to before 5.1.14Affected 5.1.14Not affected 4.2 to before 4.2.26Affected 4.2.26Not affected

References

Django security archivevendor-advisory
Django releases announcementsmailing-list
Django security releases issued: 5.2.8, 5.1.14, and 4.2.26vendor-advisory

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