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PYSEC-2026-197

Quick fix

PYSEC-2026-197 — django: upgrade to the fixed version with the command below.

pip install --upgrade 'django>=5.2.15'

Details

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 add `Authorization` to the `Vary` response header for requests bearing that header without `Cache-Control: public`, which allows remote attackers to read private cached responses via unauthenticated requests to the same URL. 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 Shai Berger for reporting this issue.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / django

Introduced in: 5.2 Fixed in: 5.2.15

Fix pip install --upgrade 'django>=5.2.15'

References

https://groups.google.com/g/django-announce [ADVISORY]
https://docs.djangoproject.com/en/dev/releases/security/ [FIX]
https://www.djangoproject.com/weblog/2026/jun/03/security-releases/ [FIX]