CVE-2026-44578 HIGH

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

Vendor Vercel
Product next.js
Weakness CWE-918 · SSRF
Published May 13, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
June 30, 2026 Record updated