CVE-2026-64642

HIGH

Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale

Title source: cna
STIX 2.1

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.

References (4)

Core 4

Scores

CVSS v4 8.3
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Details

CWE
CWE-285
Status published
Products (1)
vercel/next.js >= 16.0.0, < 16.2.11
Published Jul 27, 2026
Tracked Since Jul 28, 2026