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CVE-2026-126187 React: Unauthenticated Remote Code Execution in React Server Components

CriticalCVSS 9.5
Published
Updated
Exploit status
No public exploit known
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Description

React is a JavaScript library for building user interfaces. From 19.0.0 until 19.0.9, 19.1.10, 19.2.9, and 19.3.1, the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages are vulnerable to unauthenticated remote code execution through crafted payloads targeting frameworks that support React Server Components. The vulnerability only affects extremely rare cases where responses transport multiple typed arrays and an attacker-controlled value. Applications whose React code does not use a server are not affected. Applications that do not use a framework, bundler, or bundler plugin that supports React Server Components are not affected. This issue is fixed in versions 19.0.9, 19.1.10, 19.2.9, and 19.3.1.

Affected products

ProductAffected versionsFixed in
react = >= 19.0.0, < 19.0.9 No fix listed
react = >= 19.1.0, < 19.1.10 No fix listed
react = >= 19.2.0, < 19.2.9 No fix listed
react = >= 19.3.0, < 19.3.1 No fix listed
npm react-server-dom-parcel(npm) >= 19.0.0, < 19.0.9 19.0.9
npm react-server-dom-parcel(npm) >= 19.1.0, < 19.1.10 19.1.10
npm react-server-dom-parcel(npm) >= 19.2.0, < 19.2.9 19.2.9
npm react-server-dom-parcel(npm) >= 19.3.0, < 19.3.1 19.3.1
npm react-server-dom-turbopack(npm) >= 19.0.0, < 19.0.9 19.0.9
npm react-server-dom-turbopack(npm) >= 19.1.0, < 19.1.10 19.1.10
npm react-server-dom-turbopack(npm) >= 19.2.0, < 19.2.9 19.2.9
npm react-server-dom-turbopack(npm) >= 19.3.0, < 19.3.1 19.3.1
npm react-server-dom-webpack(npm) >= 19.0.0, < 19.0.9 19.0.9
npm react-server-dom-webpack(npm) >= 19.1.0, < 19.1.10 19.1.10
npm react-server-dom-webpack(npm) >= 19.2.0, < 19.2.9 19.2.9
npm react-server-dom-webpack(npm) >= 19.3.0, < 19.3.1 19.3.1

References