GHSA-h7pc-vwp9-298g
Django: signed cookies are vulnerable to salt namespace collisions
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15.
`django.http.HttpRequest.get_signed_cookie` in Django uses a non-injective salt derivation (concatenating the cookie name and salt argument), which allows a remote attacker to use a cookie in a context different from the one where it was signed, via distinct `(name, salt)` pairs that produce the same concatenation.
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 Peng Zhou for reporting this issue.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-6873
- https://github.com/django/django/commit/594360cbf58be7f56eb6da96d58644297c99ef85
- https://github.com/django/django/commit/70d36515b9cc71700105a14b275583070d48b689
- https://github.com/django/django/commit/c807d9c398022d23cb27518fa6ecaf343efb30cf
- https://docs.djangoproject.com/en/dev/releases/security
- https://github.com/django/django
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-199.yaml
- https://groups.google.com/g/django-announce
- https://www.djangoproject.com/weblog/2026/jun/03/security-releases