---
id: CVE-2025-14550
aliases:
  - GHSA-33mw-q7rj-mjwj
  - BIT-django-2025-14550
  - PYSEC-2026-43
title: Django has Inefficient Algorithmic Complexity
summary: Django has Inefficient Algorithmic Complexity
severity: low
vendor: django
product: django
ecosystem: pip
affected:
  - 'django >= 6.0a1, < 6.0.2'
  - 'django >= 5.2a1, < 5.2.11'
  - 'django >= 4.2a1, < 4.2.28'
patched:
  - django 6.0.2
  - django 5.2.11
  - django 4.2.28
published: '2026-02-03'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:59.357814374Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-33mw-q7rj-mjwj'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-14550'
  - url: >-
      https://github.com/django/django/commit/eb22e1d6d643360e952609ef562c139a100ea4eb
  - url: 'https://docs.djangoproject.com/en/dev/releases/security'
  - url: 'https://github.com/django/django'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-43.yaml
  - url: 'https://groups.google.com/g/django-announce'
  - url: 'https://www.djangoproject.com/weblog/2026/feb/03/security-releases'
tags:
  - osv
  - pip
epss: 0.01055
epssPercentile: 0.62979
ingestedAt: '2026-09-12T03:13:01.641Z'
---

## Overview

An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28.

`ASGIRequest` allows a remote attacker to cause a potential denial-of-service via a crafted request with multiple duplicate headers.
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 Jiyong Yang for reporting this issue.

## Affected packages

- `django >= 6.0a1, < 6.0.2`
- `django >= 5.2a1, < 5.2.11`
- `django >= 4.2a1, < 4.2.28`

## Remediation

Upgrade to a patched release:

- `django 6.0.2`
- `django 5.2.11`
- `django 4.2.28`