The Hunt for CVE-2025-66478 | Patch React & Next.js Now

A critical vulnerability has been identified in the React Server Components (RSC) protocol. The issue is rated CVSS 10.0 and can allow remote code execution when processing attacker-controlled requests in unpatched environments.

The vulnerable RSC protocol allowed untrusted inputs to influence server-side execution behavior. Under specific conditions, an attacker could craft requests that trigger unintended server execution paths. This can result in remote code execution in unpatched environments.

• Affected React versions called out in the report are 19.0.0, 19.1.0, and 19.2.0, with patched releases shown in the advisory.
• Next.js impact includes recent Canary builds plus 15x and 16x lines, check the official patch list immediately.
• The risk spreads beyond React and Next.js to any framework using RSC, including Vite and Parcel RSC plugins, React Router RSC Preview, Redwood SDK, Waku, and more.
•Cloud telemetry cited in the briefing shows roughly 39% of cloud environments running vulnerable React or Next.js versions, and 44% of cloud environments expose Next.js publicly.

Immediate action plan, do this now:

1) Upgrade React and all RSC-related dependencies to the patched releases shown in the advisories, check your package.json and update, then redeploy.

2) Check every framework and plugin that consumes RSC for vendor security updates and apply patches as soon as they are released.

The researchers stress that upgrading dependencies is the only definitive mitigation, there are no reliable workarounds or safe config flags. If you manage production systems, treat this as a 1.0 incident: notify your security team, prioritize dependency upgrades, and reduce public exposure until patches are deployed.

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