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, crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. This issue has been fixed in versions 15.5.21 and 16.2.11.
CVSS Score
HIGH
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/019628571641dec57aaf349ba0c360e3964e6f1Patch
- https://github.com/vercel/next.js/pull/96013Issue 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-m99w-x7hq-7vfjVendor Advisory
FAQ
What is CVE-2026-64641?
CVE-2026-64641 is a vulnerability with a CVSS score of 7.5 (HIGH). 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, crafted requests targeting Next.js applications using App Router w...
How severe is CVE-2026-64641?
CVE-2026-64641 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-64641?
Check the references section above for vendor advisories and patch information. Affected products include: Vercel Next.Js.