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PoC Exploit Released for Critical React, Next.js RCE Vulnerability (CVE-2025-55182)

A proof-of-concept (PoC) exploit for CVE-2025-55182 , a maximum-severity remote code execution (RCE) vulnerability in React Server Components, has been publicly released. This development raises significant concerns for developers working with affected…

JBy John MasonDec 05, 20251 min read

A proof-of-concept (PoC) exploit for CVE-2025-55182 , a maximum-severity remote code execution (RCE) vulnerability in React Server Components, has been publicly released. This development raises significant concerns for developers working with affected systems.

The flaw, known as "React2Shell," carries a CVSS score of 10.0. It impacts React versions 19.0.0 through 19.2.0 and Next.js versions 15.x and 16.x that utilize the App Router. All applications supporting React Server Components (RSC) are potentially vulnerable, regardless of their specific server function implementations.

A security researcher demonstrated the exploit using a multipart HTTP request to inject a Node.js payload. The exploit can execute a child process , such as launching a calculator on a Linux server, without requiring authentication.

The vulnerability stems from insecure deserialization in the RSC Flight protocol, which allows malformed payloads to manipulate object prototypes and execute server-side code. The exploit utilizes techniques like Blob references to bypass serialization protections.

This development raises significant concerns for developers working with affected systems.
John Mason · Thehackingpost

The issue was discovered by Lachlan Davidson and disclosed to Meta and Vercel on November 29, becoming public on December 3. Immediate patches were released, and a new scanner tool was introduced to detect vulnerable endpoints.

Amazon's threat intelligence reported exploitation attempts by specific groups shortly after the vulnerability was disclosed. It is estimated that approximately 39% of cloud environments might host vulnerable instances, affecting over 968,000 servers.

Developers are advised to audit their deployments, apply patches from React version 19.2.1 and newer, as well as update Next.js versions accordingly. Monitoring for any anomalies is also recommended to mitigate potential risks.

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While no widespread breaches have been confirmed, the simplicity of the PoC underscores the importance of addressing vulnerabilities in server-side rendering within JavaScript frameworks.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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