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CVE-2026-44578

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

Published: May 13, 2026Updated: May 14, 2026 Sources: CVE List NVD BDUCWE-918
NVD MITRE
8.6CVSSHIGH
EPSS Score
2.8%
Top 15.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-918

Affected Products

next.jsvercel
LibraryLibrary
OSS Libraries / web-framework
Next.jsVercel
LibraryLibrary
OSS Libraries / web-framework
vercelcommercialUSOSS Librariesaka vercel

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

References

https://github.com/vercel/next.js/security/advisories/GHSA-c4j6-fc7j-m34r
github.com
https://github.com/vercel/next.js/security/advisories/GHSA-c4j6-fc7j-m34r
github.com
https://github.com/dwisiswant0/next-16.2.4-pocs
github.com

Timeline

Published
May 13, 2026
Last Updated
May 14, 2026

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