CVE-2026-42196

django-s3file: Relative path traversal

State: Published
Severity: 9.9 Critical
Published: May 12, 2026
Updated: May 13, 2026
Reserved: Apr 25, 2026

Description

django-s3file is a lightweight file upload input for Django and Amazon S3. Prior to 7.0.2, 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. This vulnerability is fixed in 7.0.2.

Scores

CVSS	Score	Vector	Source
4.0	9.9 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-26 Path Traversal: '/dir/../filename'

Affected Products

Product	Versions
django-s3filecodingjoe	< 7.0.2Affected

References

https://github.com/codingjoe/django-s3file/security/advisories/GHSA-67qg-7284-2277

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