Resource exhaustion in Next.js - CVE-2026-64644
Published: July 22, 2026
Vulnerability identifier: #VU139035
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-64644
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: vercel
Affected software:
Next.js
Next.js
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the Image Optimization API endpoint when processing remotely hosted malicious SVG images through the /_next/image endpoint. A remote attacker can supply a specially crafted SVG image to cause a denial of service.
Only self-hosted deployments using the default image loader with remote image optimization configured are vulnerable. Only configured remotePatterns are affected, and exploitation can lead to CPU exhaustion.
How to mitigate CVE-2026-64644
Install security update from vendor's website.