CVE-2026-42196: django-s3file is vulnerable to relative path traversal

May 5, 2026 (updated October 27, 2026)

S3FileMiddleware is vulnerable to relative path traversal attacks, where an attacker can use a modified request to escape pre-signed upload locations and have the Django application load files from random locations into request.FILES

Depending on how files are handled, this may lead to confidentiality and integrity issues.

References

github.com/advisories/GHSA-67qg-7284-2277
github.com/codingjoe/django-s3file/security/advisories/GHSA-67qg-7284-2277
github.com/pypa/advisory-database/tree/main/vulns/django-s3file/PYSEC-2026-328.yaml
nvd.nist.gov/vuln/detail/CVE-2026-42196
pypi.org/project/django-s3file

Code Behaviors & Features

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