Executive brief
A denial of service vulnerability exists in React's server-side rendering components used to handle Server Functions. An attacker can send specially crafted web requests to crash the application or make it unresponsive by exhausting its memory and processing power. This can lead to service outages and impact the availability of web applications built with React Server Components.
Technical details
The vulnerability is classified as Uncontrolled Resource Consumption (CWE-400) and Allocation of Resources Without Limits or Throttling (CWE-770) within the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages. It occurs when processing specially crafted HTTP requests directed at server function endpoints. An unauthenticated remote attacker can exploit this to trigger out-of-memory (OOM) exceptions or excessive CPU utilization, leading to a denial of service. The issue affects React 19.x branches and has been patched in versions 19.0.8, 19.1.9, and 19.2.8.
Affected products
- Meta react-server-dom-webpack 19.0.0-19.0.7, 19.1.0-19.1.8, 19.2.0-19.2.7
- Meta react-server-dom-parcel 19.0.0-19.0.7, 19.1.0-19.1.8, 19.2.0-19.2.7
- Meta react-server-dom-turbopack 19.0.0-19.0.7, 19.1.0-19.1.8, 19.2.0-19.2.7
Timeline
- 2026-07-21: disclosed
- 2026-07-21: advisory: NVD publication date
- 2026-07-24: advisory: GitHub Advisory reviewed