vercel/next.js · Security
Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
- GHSA ID
- GHSA-6gpp-xcg3-4w24
- CVE ID
- CVE-2026-64642
- Severity
- high
- Published
- Updated
- 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
Description
Impact
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.
Workarounds
If you cannot upgrade immediately, enforce authorization in the page's server-side data path instead of relying solely on middleware.
CWEs
- CWE-285 · Improper Authorization
References
- 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/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151 ↗
- https://github.com/vercel/next.js/releases/tag/v16.2.11 ↗
- https://github.com/advisories/GHSA-6gpp-xcg3-4w24 ↗