{"id":100537,"date":"2025-12-05T13:15:14","date_gmt":"2025-12-05T07:45:14","guid":{"rendered":"https:\/\/www.seminarsonly.com\/news\/?p=100537"},"modified":"2025-12-05T15:11:35","modified_gmt":"2025-12-05T09:41:35","slug":"cve-2025-66478-next-js-react-server-components-rce","status":"publish","type":"post","link":"https:\/\/seminarsonly.com\/news\/cve-2025-66478-next-js-react-server-components-rce\/","title":{"rendered":"CVE-2025-66478 | Next.js \/ React Server Components RCE"},"content":{"rendered":"

VE-2025-66478<\/b> is a critical vulnerability affecting Next.js applications that utilize React Server Components (RSC). It allows an unauthenticated remote attacker to execute arbitrary code on the server.<\/em><\/span><\/h3>\n

CVE-2025-66478: Next.js \/ React Server Components RCE<\/b><\/h3>\n

Status:<\/b> Critical (CVSS 10.0)<\/p>\n

Vulnerability Type:<\/b> Remote Code Execution (RCE) via Insecure Deserialization<\/p>\n

Affected Software:<\/b> Next.js (specifically applications using the App Router<\/b>)<\/p>\n

Upstream Root Cause:<\/b> CVE-2025-55182 (React)<\/p>\n

\n

Overview<\/b><\/span><\/h2>\n

CVE-2025-66478<\/b> is a critical vulnerability affecting Next.js applications that utilize React Server Components (RSC). It allows an unauthenticated remote attacker to execute arbitrary code on the server.<\/p>\n

Note on CVE Status:<\/b> You may see this CVE listed as “Rejected” or a “Duplicate” in some databases (like NVD). This is procedural; the vulnerability is real, but it is technically a duplicate of the upstream React vulnerability (CVE-2025-55182<\/b>). However, CVE-2025-66478<\/b> is still the primary identifier used to track the specific impact on Next.js.<\/p>\n

Also Read : 500 Internal Server Error Cloudflare | How to Fix<\/a><\/h3>\n
\n

Technical Details<\/b><\/span><\/h2>\n
    \n
  • \n

    Root Cause:<\/b> The vulnerability exists in the React Server Components (RSC) “Flight” protocol. It involves insecure deserialization of payload data sent to the server.<\/p>\n<\/li>\n

  • \n

    Attack Vector:<\/b> An attacker can send a specially crafted HTTP request to a Next.js server (targeting Server Actions or App Router endpoints). The server fails to properly validate the structure of the incoming payload, allowing the attacker to manipulate server-side execution logic.<\/p>\n<\/li>\n

  • \n

    Authentication:<\/b> No authentication is required to exploit this flaw.<\/p>\n<\/li>\n

  • \n

    Impact:<\/b> Full server compromise (Remote Code Execution).<\/p>\n<\/li>\n<\/ul>\n

    \n

    Affected Versions<\/b><\/span><\/h2>\n

    This vulnerability affects Next.js projects using the App Router<\/b>.<\/p>\n

      \n
    • \n

      Next.js 15.x<\/b> (Prior to patched versions)<\/p>\n<\/li>\n

    • \n

      Next.js 16.x<\/b> (Prior to patched versions)<\/p>\n<\/li>\n

    • \n

      Next.js 14.3.0-canary.77<\/b> and later canary releases.<\/p>\n<\/li>\n<\/ul>\n

      Note: Next.js 13.x, Next.js 14.x (stable), and Pages Router applications are not<\/b> affected.<\/i><\/p>\n

      \n

      Remediation & Patches<\/b><\/span><\/h2>\n

      Immediate patching is required. Upgrade your Next.js dependency to one of the following fixed versions (or newer):<\/p>\n\n\n\n\n\n\n\n
      Release Line<\/strong><\/td>\nFixed Version (Minimum)<\/strong><\/td>\n<\/tr>\n<\/thead>\n
      Next.js 16<\/b><\/span><\/td>\n16.0.7<\/code><\/span><\/td>\n<\/tr>\n
      Next.js 15<\/b><\/span><\/td>\n15.5.7<\/code>, 15.4.8<\/code>, 15.3.6<\/code>, 15.2.6<\/code>, 15.1.9<\/code>, 15.0.5<\/code><\/span><\/td>\n<\/tr>\n
      Next.js 14 (Canary)<\/b><\/span><\/td>\nDowngrade to stable v14<\/code> or upgrade to 15.x<\/code><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      \n

      Next Steps<\/b><\/span><\/h2>\n
        \n
      1. \n

        Check your package.json<\/code><\/b> to see if you are using an affected version of next<\/code>.<\/p>\n<\/li>\n

      2. \n

        Run npm audit<\/code><\/b> or your preferred SCA tool to verify vulnerable dependencies.<\/p>\n<\/li>\n

      3. \n

        Update immediately:<\/b><\/p>\n

        \n
        Bash<\/span><\/div>\n
        \n
        \n
        npm install next@latest\r\n# OR for a specific version line<\/span>\r\nnpm install next@15.5.7<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
        VE-2025-66478 is a critical vulnerability affecting Next.js applications that utilize React Server Components (RSC). It allows an unauthenticated remote attacker to execute arbitrary code on the server. CVE-2025-66478: Next.js \/…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6048],"tags":[],"class_list":["post-100537","post","type-post","status-publish","format-standard","hentry","category-error-fix"],"yoast_head":"\nCVE-2025-66478 | Next.js \/ React Server Components RCE - Seminarsonly.com<\/title>\n<meta name=\"description\" content=\"VE-2025-66478 is a critical vulnerability affecting Next.js applications that utilize React Server Components (RSC). 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