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CVE-2026-64642 is an authentication and authorization bypass vulnerability in Next.js affecting versions 16.0.0 through 16.2.10. The flaw occurs in applications using the App Router, built with Turbopack, and configured with exactly one locale entry in config.i18n.locales. Under these conditions, crafted requests can bypass middleware- or proxy-based authentication and authorization checks. The issue is described as affecting middleware handling in this specific routing and internationalization configuration, including deployments using legacy middleware.ts patterns, allowing requests to reach protected application functionality without the expected middleware enforcement. The vulnerability was fixed in Next.js 16.2.11.
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An authentication bypass vulnerability in Next.js affecting App Router applications built with Turbopack and a single entry in config.i18n.locales, allowing crafted requests to bypass middleware/proxy-based authentication.
A high-severity middleware/proxy bypass vulnerability in Next.js App Router applications using Turbopack builds with legacy middleware.ts and single-locale i18n, potentially allowing authorization bypass.
A Next.js middleware authentication bypass vulnerability affecting certain App Router applications built with Turbopack and a single i18n locale configuration.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.