GHSA-8cjm-8mp7-r2xf
Django: UpdateCacheMiddleware may disclose cached responses due to case-sensitive Cache-Control handling
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6.
`django.middleware.cache.UpdateCacheMiddleware` in Django does not match `Cache-Control` response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their `Cache-Control` directives used uppercase or mixed-case values.
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 Ahmed Badawe for reporting this issue.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-8404
- https://github.com/django/django/commit/366d9ae6e8d1469c04e9ebdc1bcd098fc14a3b1e
- https://github.com/django/django/commit/b4330259ffbe1a031ed14daab1f35697460f10f2
- https://github.com/django/django/commit/d618d7ae4fec727d5b582bd24f803c28d17bf7cd
- https://docs.djangoproject.com/en/dev/releases/security
- https://github.com/django/django
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-201.yaml
- https://groups.google.com/g/django-announce
- https://www.djangoproject.com/weblog/2026/jun/03/security-releases