CVE-2026-44577 MEDIUM

CVE-2026-44577: Next.js: Denial of Service in the Image Optimization API

Vendor Vercel
Product next.js
Weakness CWE-770 · Uncontrolled resource consumption
Published May 13, 2026
Last update June 30, 2026

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Next.js is a React framework for building full-stack web applications. From 10.0.0 to before 15.5.16 and 16.2.5, when self-hosting Next.js with the default image loader, the Image Optimization API fetches local images entirely into memory without enforcing a maximum size limit. An attacker could cause out-of-memory conditions by requesting large local assets from the /_next/image endpoint that match the images.localPatterns configuration (by default, all patterns are allowed). This vulnerability is fixed in 15.5.16 and 16.2.5.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
June 30, 2026 Record updated