Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
## 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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-64642US | high8.2 | — | ||
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 wi… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/vercel/next.jsPACKAGE
- https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151WEB
- https://github.com/vercel/next.js/pull/96014WEB
- https://github.com/vercel/next.js/releases/tag/v16.2.11WEB
- https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24WEB
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