CVE-2026-64644CWE-407

Next.js: Denial of Service in the Image Optimization API using SVGs

Medium · published July 27, 2026

CVSS v4.0
6.3
EPSS
1%
Percentile
51.2
In the wild
Unconfirmed
What it is

Next.js is a React framework for building full-stack web applications. In versions 15.5.0 through 15.5.20 and 16.0.0 through 16.2.10, when self-hosting Next.js with the default image loader, the Image Optimization API can optimize remotely hosted images if configured (not enabled by default). If those images contain malicious content, they can cause CPU exhaustion in /_next/image endpoints.Only config.images.remotePatterns is affected, and just the patterns in that array, whereas config.images.unoptimized: true, config.images.loader: 'custom', and Vercel are not impacted. This issue has been fixed in versions 15.5.21 and 16.2.11.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00666 · 51.2th percentile
Weakness
CWE-407 · Inefficient Algorithmic Complexity
Published
2026-07-27T17:54Z
EPSS history
Timeline
  • 27 JUL 17:54Z
    Next.js: Denial of Service in the Image Optimization API using SVGs
    cvelistv5