CVE-2026-23869: Meta React-Server-Dom-Parcel

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.

Affected products

• Meta React-Server-Dom-Parcel: from 19.0.0, up to and including 19.0.4; from 19.1.0, up to and including 19.1.5; from 19.2.0, up to and including 19.2.4
• Meta React-Server-Dom-Turbopack: from 19.0.0, up to and including 19.0.4; from 19.1.0, up to and including 19.1.5; from 19.2.0, up to and including 19.2.4
• Meta React-Server-Dom-Webpack: from 19.0.0, up to and including 19.0.4; from 19.1.0, up to and including 19.1.5; from 19.2.0, up to and including 19.2.4
• Red Hat Red Hat Openshift Ai Rhoai

Published 2026-04-08. Last modified 2026-07-25.