Vulnerability Intelligence Report
Next.js: Server-side request forgery in applications using WebSocket upgrades
CVE-2026-44578
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.
Nuclei Template
CVSS Base Score
8.6
HIGH
Exploitability:3.9
Impact Score:4.0
EPSS Probability:38.87%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
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Weaknesses (CWE)
CWE-918 ↗CWE-918: Server-Side Request Forgery (SSRF)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| vercel | next.js | >= 16.0.0, < 16.2.5 (affected), >= 13.4.13, < 15.5.16 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | GitHub, Inc. · Vendor · USA |
| Reserved | 2026-05-06T21:49:12 |
| Published | 2026-05-13T17:01:38 |
| Last Updated | 2026-08-13T12:04:23 |
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