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CVE-2026-64643— Next.js: Unauthenticated Disclosure of Internal Server Function endpoints

CVSS 6.3 · Medium EPSS 0.52% · P41

Affected Version Matrix 2

VendorProductVersion RangeStatus
vercelnext.js>= 13.0.0, < 15.5.21affected
>= 16.0.0, < 16.2.11affected
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I. Basic Information for CVE-2026-64643

Vulnerability Information
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Vulnerability Title
Next.js: Unauthenticated Disclosure of Internal Server Function endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references). Affected users are applications using App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses. This issue has been fixed in versions 15.5.21 and 16.2.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
vercelnext.js >= 13.0.0, < 15.5.21 -

II. Public POCs for CVE-2026-64643

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III. Intelligence Information for CVE-2026-64643

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Patches & Fixes for CVE-2026-64643 (1)

Vendor Advisories for CVE-2026-64643 (1)

Vendor Pages for CVE-2026-64643 (1)

Same Patch Batch · vercel · 2026-07-27 · 9 CVEs total

CVE-2026-646428.3 HIGHNext.js: Middleware / Proxy bypass in App Router applications using Turbopack and single l
CVE-2026-646458.3 HIGHNext.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostn
CVE-2026-646498.3 HIGHNext.js: Server-Side Request Forgery in Server Actions on Custom Servers
CVE-2026-646418.2 HIGHNext.js: Denial of Service in App Router using Server Actions
CVE-2026-646446.3 MEDIUMNext.js: Denial of Service in the Image Optimization API using SVGs
CVE-2026-646466.3 MEDIUMNext.js: Unbounded Server Action payload in Edge runtime
CVE-2026-646476.3 MEDIUMNext.js: Response Body Cache Confusion with Invalid UTF-8 Request Bodies
CVE-2026-646486.0 MEDIUMNext.js: Response Body Cache Confusion for Requests Containing Bodies

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-201

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