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.

Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-c4j6-fc7j-m34r Next.js vulnerable to server-side request forgery in applications using WebSocket upgrades
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 13 May 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Vercel
Vercel next.js
Vendors & Products Vercel
Vercel next.js

Wed, 13 May 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 13 May 2026 18:00:00 +0000

Type Values Removed Values Added
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.
Title Next.js: Server-side request forgery in applications using WebSocket upgrades
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-13T18:19:41.524Z

Reserved: 2026-05-06T21:49:12.424Z

Link: CVE-2026-44578

cve-icon Vulnrichment

Updated: 2026-05-13T18:09:18.775Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-13T18:16:17.990

Modified: 2026-05-13T18:17:16.127

Link: CVE-2026-44578

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T20:30:04Z

Weaknesses