CVE-2025-27142 Information

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.

Reference

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