An information leak vulnerability exists in specific configurations of React...

Vulnerability Description

An information leak vulnerability exists in specific configurations of React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. A specifically crafted HTTP request sent to a vulnerable Server Function may unsafely return the source code of any Server Function. Exploitation requires the existence of a Server Function which explicitly or implicitly exposes a stringified argument.

References

• https://www.facebook.com/security/advisories/cve-2025-55183
• https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components