CVE-2026-64641

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.

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Weakness Type (CWE)

CWE-834 CWE-834

References

Other References

https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12 https://github.com/vercel/next.js/pull/96013 https://github.com/vercel/next.js/releases/tag/v15.5.21 https://github.com/vercel/next.js/releases/tag/v16.2.11 https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj

Frequently Asked Questions

What is CVE-2026-64641? +

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.

How do I check if I'm vulnerable to CVE-2026-64641? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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