A pre-authentication denial of service vulnerability exists in React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.

Summary

A pre-authentication denial of service vulnerability exists in 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. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.

Timeline

1. Dec 11, 2025, 8:05 PM UTCCVE published
2. Dec 15, 2025, 4:36 PM UTCCISA SSVC assessment

   Exploitation: poc · Automatable: yes · Technical impact: partial

3. Dec 15, 2025, 4:37 PM UTCRecord last updated
4. Oct 28, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• Meta react-server-dom-webpack

  From 19.0.0 · through 19.0.1; From 19.1.0 · through 19.1.2; From 19.2.0 · through 19.2.1

• Meta react-server-dom-turbopack

  From 19.0.0 · through 19.0.1; From 19.1.0 · through 19.1.2; From 19.2.0 · through 19.2.1

• Meta react-server-dom-parcel

  From 19.0.0 · through 19.0.1; From 19.1.0 · through 19.1.2; From 19.2.0 · through 19.2.1

• react-server-dom-parcelnpm

  From 19.0.0 · fixed in 19.0.2

• react-server-dom-turbopacknpm

  From 19.0.0 · fixed in 19.0.2

• react-server-dom-webpacknpm

  From 19.0.0 · fixed in 19.0.2

• react-server-dom-parcelnpm

  From 19.1.0 · fixed in 19.1.3

• react-server-dom-parcelnpm

  From 19.2.0 · fixed in 19.2.2

• react-server-dom-turbopacknpm

  From 19.1.0 · fixed in 19.1.3

• react-server-dom-turbopacknpm

  From 19.2.0 · fixed in 19.2.2

• react-server-dom-webpacknpm

  From 19.1.0 · fixed in 19.1.3

• react-server-dom-webpacknpm

  From 19.2.0 · fixed in 19.2.2

References 12