# CVE-2026-64642: Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale

> CVE-2026-64642: Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single locale. CVSS 8.2 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-64642
Last updated: 2026-10-24T13:10:00Z

- Published: 2026-07-27 17:45 UTC · Updated: 2026-10-24 13:10 UTC · Assigner: GitHub\_M
- CVSS: 8.2 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- EPSS: 0.63%, 50th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-285

## 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.

## Affected vendors and products

- vercel: next.js

## Tracked companies

- [Vercel](https://rewindex.com/company/vercel.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-64642)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-64642)
- [https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151](https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151)
- [https://github.com/vercel/next.js/pull/96014](https://github.com/vercel/next.js/pull/96014)
- [https://github.com/vercel/next.js/releases/tag/v16.2.11](https://github.com/vercel/next.js/releases/tag/v16.2.11)
- [https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24](https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-64642 · Markdown: https://rewindex.com/cve/CVE-2026-64642.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-64642 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:11.116Z