Vulnerability Description
Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive memory consumption if that Server Actions uses the Edge runtime. 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 | >= 13.0.0, < 15.5.21 |
Related Weaknesses (CWE)
References
- https://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446aPatch
- https://github.com/vercel/next.js/commit/9a4651e754f70b12e397694ffc41f44c3ba8cc1Patch
- 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-4c39-4ccg-62r3Vendor Advisory
FAQ
What is CVE-2026-64646?
CVE-2026-64646 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 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, requests targeting Next.js applications using App Router with at l...
How severe is CVE-2026-64646?
CVE-2026-64646 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-2026-64646?
Check the references section above for vendor advisories and patch information. Affected products include: Vercel Next.Js.