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High · 8.6 Scanner template Public exploit CVE-2026-44578 EUVD-2026-30080GHSA-c4j6-fc7j-m34r

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

Published May 13, 2026 · Updated Aug 13, 2026 · Assigned by GitHub_M

Vendor: vercel Product: next.js Package: next Ecosystem: npm

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.

Affected products

VendorProductAffectedFixed
vercel next.js >= 16.0.0, < 16.2.5, >= 13.4.13, < 15.5.16 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 8 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.

Affected packages

EcosystemPackageAffectedFixedRecord
npm next >= 13.4.13, < 15.5.16 15.5.16 GHSA-c4j6-fc7j-m34r
npm next >= 16.0.0, < 16.2.5 16.2.5 GHSA-c4j6-fc7j-m34r

Advisories 1

References