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Description

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.

PUBLISHED Reserved 2026-04-23 | Published 2026-05-05 | Updated 2026-05-06 | Assigner DSF




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
LOW: 2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-524: Use of Cache Containing Sensitive Information

Product status

Default status
unaffected

6.0 (python) before 6.0.5
affected

6.0.5 (python)
unaffected

5.2 (python) before 5.2.14
affected

5.2.14 (python)
unaffected

Timeline

2026-03-06:Initial report received.
2026-04-23:Vulnerability confirmed.
2026-05-05:Security release issued.

Credits

Ahmad Sadeddin reporter

Sarah Boyce remediation developer

Sarah Boyce coordinator

References

docs.djangoproject.com/en/dev/releases/security/ (Django security archive) vendor-advisory

groups.google.com/g/django-announce (Django releases announcements) mailing-list

www.djangoproject.com/weblog/2026/may/05/security-releases/ (Django security releases issued: 6.0.5 and 5.2.14) vendor-advisory

cve.org (CVE-2026-6907)

nvd.nist.gov (CVE-2026-6907)

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