Vulnerability advisory

PYSEC-2025-107

Published Nov 5, 2025Updated Jun 10, 2026OSV record ↗

Also known as BIT-django-2025-64458CVE-2025-64458GHSA-qw25-v68c-qjf3

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected versions

django PyPI

Affected	Fixed in
`4.2` to before 4.2.26	`4.2.26`Advisories →
`5.1` to before 5.1.14	`5.1.14`Advisories →
`5.2` to before 5.2.8	`5.2.8`Advisories →
Also listed as affected (48) `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`

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.

PYSEC-2025-107

Affected versions

django PyPI

Description

References