Remote Code Execution Security Bug in React Server Components Patched
Blog post from Semgrep
A recently disclosed security advisory from the React team highlights a critical Remote Code Execution (RCE) vulnerability, identified as CVE-2025-55182, which affects several React Server Functions packages and could potentially impact downstream frameworks like next, react-router, and others. This vulnerability, which stems from insecure deserialization of HTTP payloads, allows attackers to execute arbitrary code on servers, posing significant security risks. Hosting providers such as Cloudflare, Vercel, and Railway have implemented firewall rules to mitigate this threat, but developers are advised to update to the latest patched versions to ensure protection. Additionally, Semgrep Supply Chain offers tools to scan codebases for these vulnerabilities, allowing users to quickly identify and address any potential exposures. The React team has provided update instructions to guide affected users in securing their systems, emphasizing the severity of RCE vulnerabilities in enabling unauthorized access and potential exploitation for malicious purposes.
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