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

> Nearby attackers can exploit path traversal in LocalSend to write arbitrary files, potentially achieving remote code execution via startup folders or shell scripts.

- **Severity:** Medium 6.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Feb 2025
- **Updated:** 26 Feb 2025
- **Also known as:** GHSA-f7jp-p6j4-3522

## What is CVE-2025-27142?

CVE-2025-27142 is a medium-severity path traversal vulnerability in localsend, published on 25 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2025-27142?

It affects 1 product.


Products: Localsend Localsend.

## How do I fix CVE-2025-27142?

No fix has been published for CVE-2025-27142 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-27142 being exploited?

There is no known exploitation of CVE-2025-27142 in the wild and no public exploit code.

## Other vulnerabilities in localsend

- [CVE-2025-54792](https://insights.sbomify.com/CVE-2025-54792/): LocalSend is Vulnerable to Man-in-the-Middle Attacks, Leading to File Interception (critical 9.3)
- [CVE-2026-25154](https://insights.sbomify.com/CVE-2026-25154/): LocalSend has Stored XSS in Web Share Interface via Filename (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-27142 and fix it if it is affected.

What it is: CVE-2025-27142 is a medium-severity path traversal vulnerability in localsend, published on 25 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-27142 in the wild and no public exploit code.

Affected product: localsend. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-27142/ (Markdown: https://insights.sbomify.com/CVE-2025-27142/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-27142
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-27142
- OSV: https://osv.dev/vulnerability/CVE-2025-27142

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-27142/
Summaries are generated and may contain mistakes; the official description above is the record.