CVE-2026-64641

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 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 v3.1 Score

7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 7/27/2026Modified: 7/29/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-64641 — Next.js is a React framework for building full-stack web applications. In versio...

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.

CVE-2026-64641
NIST NVD

References (5)

https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12Patchhttps://github.com/vercel/next.js/pull/96013Issue TrackingPatchhttps://github.com/vercel/next.js/releases/tag/v15.5.21ProductRelease Noteshttps://github.com/vercel/next.js/releases/tag/v16.2.11ProductRelease Noteshttps://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfjVendor Advisory