CVE-2025-64458
Potential denial-of-service vulnerability in HttpResponseRedirect and HttpResponsePermanentRedirect on Windows
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.
How to fix CVE-2025-64458
To remediate CVE-2025-64458, upgrade the affected package to a fixed version below.
- —upgrade to 4.2.26 or later
- —no fix listed
- —upgrade to 5.2.8 or later
- —upgrade to 4.2.26 or later
Is CVE-2025-64458 being exploited?
Low — EPSS is 1.9%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- >= 4.2.0, < 4.2.26, >= 5.1.0, < 5.1.14, >= 5.2.0, < 5.2.8
- from 0
- >= 5.2a1, < 5.2.8
- >= 4.2, < 4.2.26, >= 5.1, < 5.1.14, >= 5.2, < 5.2.8
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |