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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
More exploitable than 98% of all CVEs · Top 2%
of the sites UNPWNED scans run Next.js, the technology this CVE affects. Version determines exposure, so scan yours to know for sure.Aggregate across 277 scanned sites. No site is identified.
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- Published
- 2026-05-13
- Last modified
- 2026-07-16
- Affected
- Next.js
Data from the National Vulnerability Database (NVD), CISA KEV, and FIRST.org EPSS. This product uses the NVD API but is not endorsed or certified by the NVD. EPSS is a probability estimate, not a guarantee of exploitation.