New Vulnerabilities in React Server Components Demand Urgent Action
Recent vulnerabilities in React Server Components (RSC) have raised alarms among IT professionals. Attackers can exploit two high-severity denial-of-service (DoS) bugs, CVE-2025-55184 and CVE-2025-67779, along with a medium-severity source-code exposure flaw, CVE-2025-55183, putting vulnerable servers at risk. All users of RSC or frameworks that support it need to act quickly to patch their systems.
Key Details
Who: Meta, the creator of the React library.
What: Three new vulnerabilities affecting versions 19.0.0 to 19.2.2 of RSC.
When: Disclosed in December 2025.
Where: Impacting RSC packages, including react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack.
Why: These vulnerabilities can allow remote code execution and Denial of Service attacks, jeopardizing the performance and security of affected servers.
How: Attackers can execute specially crafted HTTP requests, leading to an infinite loop that hangs the server process and leaks sensitive source code under specific conditions.
Why It Matters
The implications of these vulnerabilities are significant for IT infrastructure:
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Enterprise Security: The potential for remote code execution escalates security risks, making timely patching critical.
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Performance Impact: Denial-of-service attacks can degrade server performance, hindering user access.
- Compliance and Governance: Organizations using RSC risk exposure due to security flaws, necessitating adherence to regulatory requirements.
Takeaway
IT managers and system administrators must prioritize applying security patches for RSC immediately. If you previously updated your systems, ensure they are running the latest versions to mitigate these risks. Consider implementing additional monitoring to detect unusual server behaviors as a precaution.
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