React

A denial of service vulnerability (CVE-2026-44907) affects multiple versions of the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages, allowing threat actors to trigger out-of-memory exceptions or excessive CPU usage by sending specially crafted HTTP requests to server function endpoints.

A high-severity Cross-Site Request Forgery (CSRF) bypass vulnerability in React Router's unstable React Server Components (RSC) APIs allows for action execution before a 400 response, impacting applications utilizing these specific APIs.

CVE-2024-58353 describes a cross-site scripting (XSS) vulnerability in Cal.com (repository calcom/cal.diy) versions up to and including 4.7.15, where an attacker can inject malicious HTML/JavaScript into booking question labels that is then executed via React's dangerouslySetInnerHTML when a victim visits a publicly accessible single booking view, allowing for arbitrary client-side code execution, particularly impacting self-hosted instances with open registration.

@vitejs/plugin-rsc is vulnerable to a denial-of-service attack due to an embedded vulnerable version of react-server-dom-webpack, potentially causing resource exhaustion.

A denial of service vulnerability, CVE-2026-23869, exists in React Server Components due to excessive CPU usage triggered by specially crafted HTTP requests to Server Function endpoints, potentially leading to service disruption.