CVE-2026-126187: React: Unauthenticated Remote Code Execution in React Server Components
### Impact Crafted payloads targeting frameworks supporting React Server Components can lead to remote code execution. This only affects extremely rare cases where responses transport multiple typed arrays and an attacker-controlled value. Updating immediately is recommended. The vulnerability exists in versions 19.0.0 through 19.0.8, 19.1.0 through 19.1.9, 19.2.0 through 19.2.8 and 19.3.0 of: - react-server-dom-webpack - react-server-dom-parcel - react-server-dom-turbopack ### Patches Fixes were back ported to versions 19.0.09, 19.1.10, 19.2.9, and 19.3.1. If applications are using any of the above packages please upgrade to any of the fixed versions immediately. If an app’s React code does not use a server, the app is not affected by this vulnerability. If an app does not use a framework, bundler, or bundler plugin that supports React Server Components, the app is not affected by this vulnerability.
Recommended action
Recommended action
Upgrade affected packages to a patched version: react-server-dom-parcel 19.0.9, react-server-dom-parcel 19.1.10, react-server-dom-parcel 19.2.9, react-server-dom-parcel 19.3.1, react-server-dom-turbopack 19.0.9, react-server-dom-turbopack 19.1.10, react-server-dom-turbopack 19.2.9, react-server-dom-turbopack 19.3.1, react-server-dom-webpack 19.0.9, react-server-dom-webpack 19.1.10, react-server-dom-webpack 19.2.9, react-server-dom-webpack 19.3.1.
Technical details
- Vendor
- Not specified
- Product
- react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack
- Exploitation
- none known
- Evidence
- official
Evidence and sources
This record is attributed to GitHub Advisories. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.
Open primary source