How severe is CVE-2026-64642?

CVE-2026-64642 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-64642 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-64642?

CVE-2026-64642 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-64642?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-64642 published?

CVE-2026-64642 was published on 2026-07-27 and last updated on 2026-07-29.

CVE-2026-64642

CVE-2026-64642 is a high-severity vulnerability in Vercel Next.js with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v4: 8.3
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-285
Affected product: Vercel Next.js
Published: 2026-07-27
Last modified: 2026-07-29

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-64642?: CVE-2026-64642 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-64642 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-64642?: CVE-2026-64642 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-64642?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-64642 published?: CVE-2026-64642 was published on 2026-07-27 and last updated on 2026-07-29.

References

Affected products (1)

cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*

More vulnerabilities in Vercel Next.js

CVE-2025-55182 — Critical (CVSS 10.0): A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0,…
CVE-2025-29927 — Critical (CVSS 9.1): Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions…
CVE-2026-44578 — High (CVSS 8.6): Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5,…
CVE-2026-44574 — High (CVSS 8.1): Next.js is a React framework for building full-stack web applications. From 15.4.0 to before 15.5.16 and 16.2.5,…
CVE-2026-64641 — High (CVSS 7.5): Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0…
CVE-2026-45109 — High (CVSS 7.5): Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was…

All CVEs affecting Vercel Next.js →

Other CWE-285 (Improper Authorization) vulnerabilities

CVE-2025-65041 — Critical (CVSS 10.0): Improper authorization in Microsoft Partner Center allows an unauthorized attacker to elevate privileges over a network.
CVE-2023-33189 — Critical (CVSS 10.0): Pomerium is an identity and context-aware access proxy. With specially crafted requests, incorrect authorization…
CVE-2022-2595 — Critical (CVSS 10.0): Improper Authorization in GitHub repository kromitgmbh/titra prior to 0.79.1.
CVE-2021-28799 — Critical (CVSS 10.0): An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If…
CVE-2026-55166 — Critical (CVSS 9.9): Lemur manages TLS certificate creation. Prior to 1.9.2, authenticated users could influence an ACME authority acme_url…
CVE-2026-34048 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…

Browse all CWE-285 (Improper Authorization) vulnerabilities →