The critical React Server Components advisory was severe because it sat below application code. Teams could write careful product logic and still be exposed through the protocol layer used by their framework or bundler.
The response pattern should be boring and repeatable. First, identify whether the app uses a framework or bundler path that enables RSC. Second, upgrade to a patched release line rather than trying to work around the protocol. Third, redeploy and verify the exact versions running in production. Fourth, rotate secrets if the deployment window or advisory guidance indicates that exposure is possible.
The bigger architecture point is that server components are not just a rendering optimization. They create a new trust boundary between browser requests, serialized payloads, and server execution. That boundary deserves explicit ownership in threat modeling and release checklists.
For teams adopting RSC-heavy frameworks, I would add one permanent practice: keep a "framework security bump" path separate from ordinary feature releases. It should be fast, tested, and boring enough that nobody argues about whether the upgrade can wait.
Official source: Critical Security Vulnerability in React Server Components.