---
title: "Critical React Native CLI Flaw Puts Millions of Developers at Risk"
date: 2025-11-05
author: "Sofia Ramirez"
featured_image: "https://sqmagazine.co.uk/wp-content/uploads/2025/11/react-native-cli-flaw-puts-developers-in-risk.jpg"
categories:
  - name: "Cybersecurity"
    url: "/cybersecurity.md"
tags:
  - name: "News"
    url: "/tag/news.md"
---

# Critical React Native CLI Flaw Puts Millions of Developers at Risk

A serious security flaw in a widely used React Native development tool has put countless app developers in danger of remote attacks.

## Quick Summary – TLDR:

- A critical vulnerability in the @react-native-community/cli-server-api exposes systems to remote code execution.
- The flaw is tracked as CVE-2025-11953 and carries a maximum CVSS score of 9.8.
- The vulnerability affects versions 4.8.0 through 20.0.0-alpha.2 and has been patched in version 20.0.0.
- Developers are urged to update immediately or use a localhost-only workaround to stay safe.

## What Happened?

Security researchers from JFrog [discovered](https://jfrog.com/blog/cve-2025-11953-critical-react-native-community-cli-vulnerability/) a **severe remote code execution (RCE) vulnerability** affecting the popular **@react-native-community/cli-server-api** NPM package. This flaw could allow unauthenticated attackers to execute **arbitrary system commands** on machines running the React Native development server.

Millions of developers using React Native’s Metro server are potentially impacted. Meta, the package maintainer, has since released a fix, but the vulnerability underscores growing concerns around the software supply chain and third-party dependencies.

> ⚠️ Heads up, React Native devs: We’ve just disclosed CVE-2025-11953, a critical CVSS 9.8 RCE vulnerability in the React Native CLI.  
>   
> 🚩The risk: An unauthenticated network attacker can get [\#RCE](https://twitter.com/hashtag/RCE?src=hash&ref_src=twsrc%5Etfw) on your machine via the running dev server.  
>   
> Full technical breakdown & mitigation… [pic.twitter.com/MJyt9l67J2](https://t.co/MJyt9l67J2)
> 
> — JFrog (@jfrog) [November 4, 2025](https://twitter.com/jfrog/status/1985712439413952718?ref_src=twsrc%5Etfw)

 ## Vulnerability Overview

The vulnerability, officially labeled **CVE-2025-11953**, affects the **React Native Community CLI**, a set of command-line tools used to build and manage React Native applications. The tool is downloaded roughly **two million times each week**, making it a high-value target for attackers.

**Key Details:**

- **CVSS Score:** 9.8 (Critical)
- **Impacted Versions:** 4.8.0 to 20.0.0-alpha.2
- **Patched Version:** 20.0.0
- **Discovery By:** JFrog security researchers, including **Or Peles**
- **Maintained By:** Meta, with community and corporate contributors like [Microsoft](https://sqmagazine.co.uk/microsoft-statistics/)

## How the Exploit Works?

At the core of the issue is the unsafe use of the **open() function** from the **open** NPM package within the **Metro development server’s /open-url endpoint**. When developers use common startup commands like **npm start or npx react-native start**, the server processes incoming POST requests.

However, instead of sanitizing this input, the server **passes it directly to the open() function**, which can trigger **system-level command execution**.

**Platform-Specific Impact:**

- **Windows:** Full control over command parameters allows complete command injection.
- **[Linux](https://sqmagazine.co.uk/linux-statistics/)/macOS:** While execution is more restricted, researchers demonstrated that **arbitrary code execution is still possible**.

Compounding the threat is a **second flaw**: the development server **binds to all network interfaces by default**, even though it claims to operate locally. This allows remote attackers to reach and exploit the server across a network, expanding what would have been a local vulnerability into a **network-exploitable issue**.

## Who Is Affected?

Any developer running a vulnerable version of **@react-native-community/cli-server-api** and using the default Metro server setup is at risk. The problem affects systems where the package is installed either locally or globally.

Users of frameworks like **Expo**, which use their own development servers, are generally not affected.

## What Should Developers Do?

**Immediate Actions:**

- **Update the Package:** Upgrade to **version 20.0.0 or later** as soon as possible.
- **Verify Installation:** Run `npm list @react-native-community/cli-server-api` in your project directory or `npm list -g @react-native-community/cli-server-api` to check global installations.
- **Apply Workaround:** If updating is not immediately possible, **bind the server to localhost** using `npx react-native start --host 127.0.0.1`.

## Industry Reaction

In their disclosure, JFrog emphasized how this flaw reveals deeper risks hidden within open source tools. Or Peles, senior researcher at JFrog, noted:

“

This zero day vulnerability is particularly dangerous due to its ease of exploitation, lack of authentication requirements and broad attack surface.

JFrog





Meta responded swiftly by issuing a patch, showing the benefits of active maintenance and community involvement in major open source projects. Still, the incident raises red flags about how easily a third-party tool can expose systems to full compromise.

## SQ Magazine’s Takeaway

I’ve seen vulnerabilities before, but this one strikes especially close to home. If you are a React Native developer, you should **not brush this off**. The fact that [attackers](https://sqmagazine.co.uk/cybersecurity-statistics/) don’t need any login and can simply fire off a POST request to hijack your dev server is **a nightmare scenario**. It shows how something as routine as a dev server could be a backdoor into your system. Always keep your tools updated, and if you’re relying on third-party packages, make sure your CI/CD includes **real security scanning**. This kind of flaw is exactly why proactive defense matters.