CVE-2026-64642

HIGH8.3

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

Published Jul 27, 2026

Modified 3 weeks ago

Details

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

WEB

https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151

WEB

https://github.com/vercel/next.js/pull/96014

WEB

https://github.com/vercel/next.js/releases/tag/v16.2.11

WEB

https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-64642

CVSS Analysis