# CVE-2025-64458

## Summary

- **CVE ID:** CVE-2025-64458
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-407
- **Published:** Nov 5, 2025
- **Last Modified:** Sep 17, 2026

## 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.

## Affected Products

- djangoproject — Django (5.2)
- djangoproject — Django (5.2.8)
- djangoproject — Django (5.1)
- djangoproject — Django (5.1.14)
- djangoproject — Django (4.2)
- djangoproject — Django (4.2.26)

## References

- [CNA](https://docs.djangoproject.com/en/dev/releases/security/)
- [CNA](https://groups.google.com/g/django-announce)
- [CNA](https://www.djangoproject.com/weblog/2025/nov/05/security-releases/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.90%
- **EPSS Percentile:** 78.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._