low3.1
CVE-2026-8404
Django: UpdateCacheMiddleware may disclose cached responses due to case-sensitive Cache-Control handling
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | django | < 5.2.15 | 5.2.15 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Djangoproject | Django | from 5.2 before 5.2.15 from 6.0 before 6.0.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-8cjm-8mp7-r2xf
- https://nvd.nist.gov/vuln/detail/CVE-2026-8404
- https://docs.djangoproject.com/en/dev/releases/security
- https://groups.google.com/g/django-announce
- https://www.djangoproject.com/weblog/2026/jun/03/security-releases
- https://github.com/django/django/commit/366d9ae6e8d1469c04e9ebdc1bcd098fc14a3b1e
- https://github.com/django/django/commit/b4330259ffbe1a031ed14daab1f35697460f10f2
- https://github.com/django/django/commit/d618d7ae4fec727d5b582bd24f803c28d17bf7cd
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-201.yaml
- https://docs.djangoproject.com/en/dev/releases/security/
- https://www.djangoproject.com/weblog/2026/jun/03/security-releases/