Description
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.
Problem types
CWE-178: Improper Handling of Case Sensitivity
Product status
6.0 (python) before 6.0.6
6.0.6 (python)
5.2 (python) before 5.2.15
5.2.15 (python)
Timeline
| 2026-05-06: | Initial report received. |
| 2026-05-12: | Vulnerability confirmed. |
| 2026-06-03: | Security release issued. |
Credits
Ahmed Badawe
Jake Howard
Natalia Bidart
References
docs.djangoproject.com/en/dev/releases/security/ (Django security archive)
groups.google.com/g/django-announce (Django releases announcements)
www.djangoproject.com/weblog/2026/jun/03/security-releases/ (Django security releases issued: 6.0.6 and 5.2.15)