Remote Code Execution (RCE) Affecting react-server-dom-webpack package, versions <19.0.9>=19.1.0 <19.1.10>=19.2.0 <19.2.9>=19.3.0 <19.3.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published12 Nov 2026
- disclosed11 Nov 2026
- creditAvishek Sarkar
Introduced: 11 Nov 2026
NewCVE-2026-126187 (opens in a new tab)How to fix?
Upgrade react-server-dom-webpack to version 19.0.9, 19.1.10, 19.2.9, 19.3.1 or higher.
Overview
react-server-dom-webpack is a React Server Components bindings for DOM using Webpack. This is intended to be integrated into meta-frameworks. It is not intended to be imported directly.
Affected versions of this package are vulnerable to Remote Code Execution (RCE) when a server response transports multiple typed arrays together with an attacker-controlled value. An attacker can execute arbitrary code on the server by sending a request to an application built on a framework that supports React Server Components. Only applications that run a server with a framework, bundler or bundler plugin that supports React Server Components, and that have a response combining multiple typed arrays with an attacker-controlled value, are affected.