CVE-2026-64642 | Next.js is a React framework for building full-stack web app… | CVSS 8.3 HIGH

Description

Next.js is a React framework for building full-stack web applications. In versions 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router built with Turbopack and a single entry in config.i18n.locales can bypass middleware/proxy based authentication. This issue has been fixed in version 16.2.11.

Metadata

CVE ID: CVE-2026-64642
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-20 17:11 UTC
Published: 2026-07-27 17:45 UTC
Last updated: 2026-07-28 15:20 UTC
Primary CWE: CWE-285
CWE-285: Improper Authorization
Vendor / Product: vercel / next.js
Sources: cve.org · NVD

Severity & Metrics

8.3 HIGH CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

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

Weakness (CWE)

CWE	Source	Description
CWE-285	cna	CWE-285: Improper Authorization

CVSS scores (1)

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

References (4)

https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24 https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24
https://github.com/vercel/next.js/pull/96014 https://github.com/vercel/next.js/pull/96014
https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151 https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151
https://github.com/vercel/next.js/releases/tag/v16.2.11 https://github.com/vercel/next.js/releases/tag/v16.2.11