Denial of Service Vulnerabilities in React Server Components by Facebook

CVE-2026-23864

What is CVE-2026-23864?

CVE-2026-23864 is a security vulnerability affecting React Server Components developed by Meta. This vulnerability exists within specific packages, including react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. It can be triggered by sending specially crafted HTTP requests to Server Function endpoints. When exploited, this vulnerability can lead to significant operational issues for organizations, including crashes of server instances and excessive consumption of memory and CPU resources. Such failures can disrupt the availability and performance of applications reliant on React Server Components, which are commonly used in web development to enable server-side rendering and improve application responsiveness.

Potential impact of CVE-2026-23864

1. Denial of Service: The primary impact of this vulnerability is the potential for denial of service, as attackers can exploit it to crash servers or cause applications to become unresponsive, directly affecting user access and satisfaction.

2. Resource Exhaustion: Exploitation can lead to severe resource exhaustion, where servers may experience out-of-memory exceptions or high CPU usage. This can degrade service quality and lead to increased operational costs for organizations needing to manage infrastructure or scale resources.

3. Operational Disruption: The vulnerability can result in significant operational disruptions, as affected applications may require manual intervention to restore functionality. This could lead to downtime, loss of productivity, and potential revenue loss for organizations relying on these services.

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