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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
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Weaponization
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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%

Identity & Timeline

StatusPUBLISHED
Assigning AuthorityGitHub, Inc. · Vendor · USA
Reserved2026-07-20T17:11:30
Published2026-07-27T17:45:40
Last Updated2026-07-28T15:20:33

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