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A remote code execution vulnerability affects specific versions of React and frameworks like Next.js using the App Router. Users of Next.js versions 15.x and 16.x need to update to patched versions immediately to mitigate the risk. Experimental canary releases starting from 14.3.0-canary.77 are also impacted.
The React2Shell vulnerability (CVE-2025-55182) allows remote attackers to execute arbitrary code on vulnerable React and Next.js servers, often without authentication. Immediate upgrades to fixed package versions are essential to mitigate the risks posed by this critical flaw.