CVE-2026-44578 PoC — Next.js: Server-side request forgery in applications using WebSocket upgrades

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2026/CVE-2026-44578.yaml

Associated Vulnerability

Title:Next.js: Server-side request forgery in applications using WebSocket upgrades (CVE-2026-44578)
Description:Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or cloud metadata endpoints. Vercel-hosted deployments are not affected. This vulnerability is fixed in 15.5.16 and 16.2.5.

Description

Next.js 13.4.13 to before 15.5.16 and 16.2.5 contains a server-side request forgery caused by crafted WebSocket upgrade requests in the built-in Node.js server, letting attackers proxy requests to arbitrary destinations, exploit requires self-hosted deployment.

File Snapshot

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