A devastating RCE vulnerability in React Server Components puts millions of apps at risk. Here's how to patch immediately.
The Threat: React2Shell
Security researchers have uncovered a critical Remote Code Execution (RCE) vulnerability in React Server Components (RSC), dubbed React2Shell (CVE-2025-55182). This flaw allows unauthenticated attackers to execute arbitrary code on the server by crafting malicious HTTP requests that exploit insecure deserialization in the "Flight" protocol.
Why It Matters
With a CVSS score of 10.0 (Critical), this is as severe as it gets. Affected frameworks include Next.js, Waku, and others using React 19.x RSC features.
Technical Breakdown
The vulnerability resides in how React decodes data sent to Server Functions. By injecting a specifically crafted payload, an attacker can trigger the execution of system commands before authentication middleware even runs.
Remediation
- Patch Immediately: Upgrade to React 19.0.1+ or Next.js 15.1+.
- WAF Rules: While not a fix, strict WAF rules blocking suspicious serialized objects can buy time.
- Audit Logs: Check your server logs for irregular POST requests to RSC endpoints.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
Key Takeaways for Enterprise Security
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
- Identify critical assets and map dependencies.
- Implement continuous monitoring with automated tools like VulnSentry.
- Establish a robust incident response plan.
Stay vigilant. The threat landscape is constantly evolving, and static defense strategies are no longer sufficient.