High severity · published Jul 27, 2026
CVE-2026-64642
Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale
8.2
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
next.js · vercel
>= 16.0.0, < 16.2.11 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64642
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64642
Patch
https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151
Issue Tracking
https://github.com/vercel/next.js/pull/96014
Product
https://github.com/vercel/next.js/releases/tag/v16.2.11
Vendor Advisory
https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24
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