CVE-2025-55182 Exploit | Vulnerability Details Fix

CVE-2025-55182 is a critical Remote Code Execution (RCE) vulnerability found in React Server Components (RSC). It has a CVSS severity score of 10.0 (Critical), meaning it is extremely dangerous and allows attackers to take control of a server without any authentication.

The following summary details the vulnerability, its current exploit status, and how to fix it.

Vulnerability Details

• What it is: A flaw in the “React Flight” protocol used by React Server Components to communicate between the server and client.

• The Cause: The vulnerability stems from unsafe deserialization. When the server processes a specific type of malicious data payload (specifically related to Server Functions), it fails to properly validate the input.

• The Impact: An unauthenticated attacker can send a specially crafted HTTP request to a vulnerable server and execute arbitrary JavaScript code. This effectively gives them full control over the server environment.

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Exploit Status

• Public Exploits: As of early December 2025, there is no public, fully functional Proof-of-Concept (PoC) exploit code widely available.

• Detection Tools: Some security researchers have released “scanners” or detection scripts. These tools do not exploit the server; they simply check if the server is exposing the vulnerable React Server Components endpoint to the public internet.

• Risk Level: Despite the lack of a public “copy-paste” exploit, the technical details (unsafe deserialization) are well-understood by security researchers and attackers. It is highly likely that private exploits are being developed or used in the wild.

Affected Software

This vulnerability affects applications using React 19 and frameworks that rely on it, most notably Next.js.

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How to Fix It

Because this is a server-side vulnerability, you must update your dependencies immediately. WAF (Web Application Firewall) rules can provide temporary mitigation, but patching is the only permanent fix.

1. Update React:

   Update react, react-dom, and any react-server-dom-* packages to the latest patch version (e.g., 19.0.1 or higher).

2. Update Next.js:

   If you are using Next.js, updating the main next package will typically pull in the patched React versions.

   Bash

   npm install next@latest react@latest react-dom@latest
   

3. Verify:

   Check your package-lock.json or yarn.lock to ensure that react-server-dom-webpack (or similar packages) resolves to a fixed version.