A critical vulnerability (CVE-2025-55182) in React Server Components allows remote code execution via prototype pollution, enabling attackers to execute arbitrary JavaScript without authentication. This matters because it affects any Next.js application using the App Router with React 19 and later versions by default, posing a significant risk to web applications relying on these frameworks. Developers should update to patched versions (19.0.2, 19.1.3, or 19.2.2) immediately to mitigate this severe threat.
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