Relative Path Traversal in django-s3file - CVE-2026-42196
Published: April 28, 2026
Vulnerability identifier: #VU128412
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-42196
CWE-ID: CWE-23
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Johannes Maron
Affected software:
django-s3file
django-s3file
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information and modify data.
The vulnerability exists due to relative path traversal in S3FileMiddleware when handling a modified request for pre-signed upload locations. A remote attacker can send a specially crafted request to disclose sensitive information and modify data.
The issue can cause the Django application to load files from unintended locations into request.FILES.
How to mitigate CVE-2026-42196
Install security update from vendor's website.