# Weaponizing And Defending The React Flight Protocol: Deserialization Sinks In RSCs

DevFeed: [Weaponizing And Defending The React Flight Protocol: Deserialization Sinks In RSCs](<https://devfeed.tech/articles/weaponizing-and-defending-the-react-flight-protocol-deserialization-sinks-in-rscs-4314.md>)

Original publisher: [Read original article](<https://smashingmagazine.com/2026/07/weaponizing-defending-react-flight-protocol/>)

Author: hello@smashingmagazine.com (Durgesh Pawar)

Published: 2026-07-21T10:00:00Z

Content type: article

Language: en

Sources: [Articles on Smashing Magazine -- For Web Designers And Developers](<https://devfeed.tech/sources/articles-on-smashing-magazine-for-web-designers-and-developers.md>)

Topics: [Flight](<https://devfeed.tech/topics/flight.md>), [React](<https://devfeed.tech/topics/react.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [Vulnerabilities](<https://devfeed.tech/topics/vulnerabilities.md>), [Cybersecurity](<https://devfeed.tech/topics/cybersecurity.md>), [Next.js](<https://devfeed.tech/topics/next-js.md>), [Security](<https://devfeed.tech/topics/security.md>)

Tags: [code](<https://devfeed.tech/tags/code.md>), [coding](<https://devfeed.tech/tags/coding.md>), [cybersecurity](<https://devfeed.tech/tags/cybersecurity.md>), [http](<https://devfeed.tech/tags/http.md>), [next-js](<https://devfeed.tech/tags/next-js.md>), [react](<https://devfeed.tech/tags/react.md>), [security](<https://devfeed.tech/tags/security.md>), [streaming](<https://devfeed.tech/tags/streaming.md>), [vulnerability](<https://devfeed.tech/tags/vulnerability.md>)

## AI overview

This article examines React Server Components' Flight streaming protocol, focusing on how its deserialization of executable references creates security risks. It analyzes the React2Shell remote code execution vulnerability and presents defenses including schema validation, CSRF hardening, the Taint API, and web application firewalls.

## Source excerpt

While React Server Components rely on the custom Flight protocol to stream interactive UIs, this same mechanism introduces powerful deserialization sinks that attackers can exploit. Durgesh Pawar breaks down the mechanics behind the CVSS 10.0 "React2Shell" vulnerability to show how protocol manipulation can lead to remote code execution.