Critical React2Shell Flaw in React and Next.js Allows Remote Code Execution
A severe vulnerability, named React2Shell and tracked as CVE-2025-55182, has been discovered in React Server Components (RSC) Flight protocol. This flaw enables unauthenticated remote code execution by exploiting unsafe deserialization. Affected versions include React 19.x and Next.js 15.x/16.x. Security researcher Lachlan Davidson reported the issue, which has a CVSS score of 10.0. Organizations are urged to apply patches immediately to mitigate risks.