Vulnerability Intelligence Report
Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
CVE-2026-64642
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.
No Active Exploit Signals
CVSS Base Score
8.3
HIGH
EPSS Probability:1.28%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-285 ↗CWE-285: Improper Authorization
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| vercel | next.js | >= 16.0.0, < 16.2.11 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
1.278%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | GitHub, Inc. · Vendor · USA |
| Reserved | 2026-07-20T17:11:30 |
| Published | 2026-07-27T17:45:40 |
| Last Updated | 2026-07-28T15:20:33 |
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