---
id: CVE-2026-25673
aliases:
  - GHSA-8p8v-wh79-9r56
  - BIT-django-2026-25673
  - PYSEC-2026-2448
title: Django vulnerable to Uncontrolled Resource Consumption
summary: Django vulnerable to Uncontrolled Resource Consumption
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: django
product: django
ecosystem: pip
affected:
  - 'django >= 6.0, < 6.0.3'
  - 'django >= 5.2, < 5.2.12'
  - 'django >= 4.2, < 4.2.29'
patched:
  - django 6.0.3
  - django 5.2.12
  - django 4.2.29
published: '2026-03-03'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:38.233232219Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-8p8v-wh79-9r56'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-25673'
  - url: 'https://docs.djangoproject.com/en/dev/releases/security'
  - url: 'https://github.com/django/django'
  - url: 'https://groups.google.com/g/django-announce'
  - url: 'https://www.djangoproject.com/weblog/2026/mar/03/security-releases'
tags:
  - osv
  - pip
epss: 0.01101
epssPercentile: 0.64223
ingestedAt: '2026-07-13T18:57:55.213Z'
---

## Overview

An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29.

`URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these 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 packages

- `django >= 6.0, < 6.0.3`
- `django >= 5.2, < 5.2.12`
- `django >= 4.2, < 4.2.29`

## Remediation

Upgrade to a patched release:

- `django 6.0.3`
- `django 5.2.12`
- `django 4.2.29`