CVE-2026-64641 | Next.js is a React framework for building full-stack web app… | CVSS 8.2 HIGH

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.

Metadata

CVE ID: CVE-2026-64641
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-20 17:11 UTC
Published: 2026-07-27 17:40 UTC
Last updated: 2026-07-27 18:54 UTC
Primary CWE: CWE-834
CWE-834: Excessive Iteration
Vendor / Product: vercel / next.js
Sources: cve.org · NVD

Severity & Metrics

8.2 HIGH CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
vercel	next.js	—	>= 13.0.0, < 15.5.21, >= 16.0.0, < 16.2.11

Weakness (CWE)

CWE	Source	Description
CWE-834	cna	CWE-834: Excessive Iteration

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.2	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References (5)

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