Key Takeaways

  • A critical vulnerability (CVE-2025-55182) affecting React Server Components, scored CVSSv3 10.0, allows Remote Code Execution due to an insecure deserialization logic error in the ReactFlight protocol.

  • Affected versions of React components include 19.0, 19.1.0, 19.1.1, and 19.2.0, with Next.js users urged to upgrade to specific safe versions (15.0.5 or later).

  • Immediate patching is recommended as no proof-of-concept exploit exists; other frameworks relying on React Server Components may also be impacted.

A critical vulnerability affecting React Server Components has been announced, allowing Remote Code Execution via insecure deserialization in affected versions, urging users to update their software immediately.