---
id: CVE-2026-113593
title: Potential exposure of private data via empty and missing Vary headers
summary: >-
  An issue was discovered in Django 6.1 before 6.1.3, 6.0 before 6.0.10, and 5.2
  before 5.2.19.

  The `django.middleware.cache.UpdateCacheMiddleware` and the
  `django.views.decorators.cache.cache_page()` decorator generate identical
  cache key…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-524
vendor: djangoproject
product: django
affected:
  - django >= 6.1 < 6.1.3
  - django >= 6.0 < 6.0.10
  - django >= 5.2 < 5.2.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-03T17:19:24.284736Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T18:26:21.601Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-113593'
references:
  - url: 'https://docs.djangoproject.com/en/dev/releases/security/'
    label: Django security archive
  - url: 'https://groups.google.com/g/django-announce'
    label: Django releases announcements
  - url: >-
      https://github.com/django/django/commit/c0b7e5e4e4546e8ddc58262f1945938bb9d9ac2d
  - url: >-
      https://github.com/django/django/commit/55e2e009b4f3996e5c55af7b22a8c41eb826e892
  - url: >-
      https://github.com/django/django/commit/2006a2b068766bf332f1afcc32b7614d8e5759a2
  - url: >-
      https://github.com/django/django/commit/9007fecd3633cfd90b093ebe106af564347c8aee
  - url: 'https://www.djangoproject.com/weblog/2026/nov/03/security-releases/'
    label: 'Django security releases issued: 6.1.3, 6.0.10, and 5.2.19'
tags:
  - cve.org
epss: 0.00464
epssPercentile: 0.40354
ingestedAt: '2026-11-05T20:33:06.346Z'
---

## Overview

An issue was discovered in Django 6.1 before 6.1.3, 6.0 before 6.0.10, and 5.2 before 5.2.19.
The `django.middleware.cache.UpdateCacheMiddleware` and the `django.views.decorators.cache.cache_page()` decorator generate identical cache keys for requests that omit a header listed in the response’s `Vary` header and requests that include that header with an empty value, potentially allowing remote attackers to access private data cached for another request.
Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected.
Django would like to thank Andrew Gonzalez for reporting this issue.

## Affected

- `django >= 6.1 < 6.1.3`
- `django >= 6.0 < 6.0.10`
- `django >= 5.2 < 5.2.19`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.