Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vercel | Next.Js | >= 15.5.0, < 15.5.21 |
Related Weaknesses (CWE)
References
- https://github.com/vercel/next.js/commit/93cb90891402fa4c47798d03cb9e05c13233766Patch
- https://github.com/vercel/next.js/pull/96006Issue TrackingPatch
- https://github.com/vercel/next.js/releases/tag/v15.5.21ProductRelease Notes
- https://github.com/vercel/next.js/releases/tag/v16.2.11ProductRelease Notes
- https://github.com/vercel/next.js/security/advisories/GHSA-q8wf-6r8g-63chVendor Advisory
FAQ
What is CVE-2026-64644?
CVE-2026-64644 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2026-64644?
CVE-2026-64644 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-64644?
Check the references section above for vendor advisories and patch information. Affected products include: Vercel Next.Js.