Bug 2466771 (CVE-2026-6907)

Summary:	CVE-2026-6907 django: Django: Information Disclosure via erroneous caching of Vary header with asterisk
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anthomas, brasmith, caswilli, cmyers, cochase, dnakabaa, dranck, dschmidt, eglynn, ehelms, erezende, ggainey, jjoyce, jlanda, jmitchel, jpasqual, jpretori, jschluet, juwatts, jwong, kaycoth, kshier, lbrazdil, lcouzens, lhh, mburns, mgarciac, mhulan, mminar, nmoumoul, omaciel, osousa, pcreech, rbiba, rchan, simaishi, smallamp, smcdonal, sskracic, stcannon, teagle, tmalecek, tpfromme, ttakamiy, yguenane
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Django. The `django.middleware.cache.UpdateCacheMiddleware` component incorrectly caches web requests when the `Vary` header contains an asterisk ('*'). This error can lead to sensitive private data being stored in the cache and subsequently served to unauthorized users, resulting in information disclosure.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-05 17:01:37 UTC

An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14.
`django.middleware.cache.UpdateCacheMiddleware` erroneously caches requests where the `Vary` header contained an asterisk (`'*'`). This can lead to private data being stored and served.
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 Ahmad Sadeddin for reporting this issue.