Denial of Service Vulnerability in React Server Components

Impact

It was found that the fix to address CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service attack in a specific case.

We recommend updating immediately.

The vulnerability exists in versions 19.0.2, 19.1.3, and 19.2.2 of:

• react-server-dom-webpack
• react-server-dom-parcel
• react-server-dom-turbopack

These issues are present in the patches published on December 11th, 2025.

Patches

Fixes were back ported to versions 19.0.3, 19.1.4, and 19.2.3.

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.