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Vulnerability record · CVE-2026-44578 · published 13 May 2026

CVE-2026-44578: Vercel next.js server-side request forgery (ssrf) vulnerability

Vercel · Next.Js

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.

8.6 CVSS 3.1 High EPSS 1.9% · top 21.2% CWE-918 · Server-side request forgery (SSRF)
8.6CVSS 3.1 base score
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
13 Aug 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/vercel/next.js/security/advisories/GHSA-c4j6-fc7j-m34r MitigationVendor Advisory
https://access.redhat.com/errata/RHSA-2026:34608
https://access.redhat.com/errata/RHSA-2026:37272
https://access.redhat.com/errata/RHSA-2026:40974
https://access.redhat.com/errata/RHSA-2026:54435
https://access.redhat.com/security/cve/CVE-2026-44578
https://bugzilla.redhat.com/show_bug.cgi?id=2477187
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44578.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-44578), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.