CVE-2026-113593

Name	CVE-2026-113593
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1152952

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-django (PTS)	bookworm	3:3.2.25-0+deb12u3	vulnerable
	bookworm (security)	3:3.2.25-0+deb12u6	vulnerable
	trixie	3:4.2.28-0+deb13u2	vulnerable
	trixie (security)	3:4.2.28-0+deb13u1	vulnerable
	forky	3:5.2.17-2	vulnerable
	sid	3:5.2.18-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-django	source	(unstable)	3:5.2.19-1			1152952

Notes

https://www.djangoproject.com/weblog/2026/nov/03/security-releases/
Fixed by: https://github.com/django/django/commit/9007fecd3633cfd90b093ebe106af564347c8aee (5.2.10)