GHSA-fv66-9v8q-g76r
CRITICALReact Server Components are Vulnerable to RCE
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
react-server-dom-webpack📦react-server-dom-webpack📦react-server-dom-webpack📦react-server-dom-turbopack📦react-server-dom-turbopack📦react-server-dom-turbopack📦react-server-dom-parcel📦react-server-dom-parcel+1 moreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
Impact
There is an unauthenticated remote code execution vulnerability in React Server Components.
We recommend upgrading immediately.
The vulnerability is present in versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 of:
Patches
A fix was introduced in versions 19.0.1, 19.1.2, and 19.2.1. If you are using any of the above packages please upgrade to any of the fixed versions immediately.
If your app’s React code does not use a server, your app is not affected by this vulnerability. If your app does not use a framework, bundler, or bundler plugin that supports React Server Components, your app is not affected by this vulnerability.
References
See the blog post for more information and upgrade instructions.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | react-server-dom-webpack | ≥ 19.0.0&&< 19.0.1 | 19.0.1 |
| 📦npm | react-server-dom-webpack | ≥ 19.1.0&&< 19.1.2 | 19.1.2 |
| 📦npm | react-server-dom-webpack | ≥ 19.2.0&&< 19.2.1 | 19.2.1 |
| 📦npm | react-server-dom-turbopack | ≥ 19.0.0&&< 19.0.1 | 19.0.1 |
| 📦npm | react-server-dom-turbopack | ≥ 19.1.0&&< 19.1.2 | 19.1.2 |
| 📦npm | react-server-dom-turbopack | ≥ 19.2.0&&< 19.2.1 | 19.2.1 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
React Server 19.2.0 - Remote Code Execution
by danieljavanrad · Apr 9, 2026
Frequently Asked Questions
Is GHSA-fv66-9v8q-g76r in your stack?
O3 detects GHSA-fv66-9v8q-g76r across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.