GHSA-3h9f-r86x-qvjx
Django: cache middleware may expose private responses when unrelated request cookies are present
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
An issue was discovered in Django 6.0 before 6.0.7 and 5.2 before 5.2.16.
`UpdateCacheMiddleware` and the `cache_page()` decorator cache responses that vary on cookies when the incoming request carries unrelated cookies, which allows remote attackers to read private data from the shared cache.
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 Chris Whyland for reporting this issue.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-48588
- https://github.com/django/django/commit/64f9a2b2283fde3ec69fb0dfe441cf0f6f411ba3
- https://github.com/django/django/commit/6e365f8d01f2ba0bbd90968d76a42600fb8bc4b1
- https://github.com/django/django/commit/721685aa7799cc9327bd202cd1f70bd012ca95a7
- https://docs.djangoproject.com/en/dev/releases/security
- https://github.com/django/django
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-2090.yaml
- https://groups.google.com/g/django-announce
- https://www.djangoproject.com/weblog/2026/jul/07/security-releases