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CVE-2026-44575— Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes

CVSS 7.5 · High EPSS 0.03% · P8
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I. Basic Information for CVE-2026-44575

Vulnerability Information
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Vulnerability Title
Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
Source: NVD (National Vulnerability Database)
Vulnerability Description
Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: NVD (National Vulnerability Database)
Vulnerability Title
Next.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Next.js是Vercel开源的一个 React 框架。 Next.js 15.2.0至15.5.16之前版本和16.2.5之前版本存在安全漏洞，该漏洞源于App Router应用依赖中间件或代理授权检查时，传输特定路由变体用于段预取，特制.rsc和段预取URL可解析到同一页面而不被中间件规则匹配，可能导致绕过授权检查访问受保护内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
vercelnext.js >= 16.0.0, < 16.2.5 -

II. Public POCs for CVE-2026-44575

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III. Intelligence Information for CVE-2026-44575

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Same Patch Batch · vercel · 2026-05-13 · 13 CVEs total

CVE-2026-445788.6 HIGHNext.js: Server-side request forgery in applications using WebSocket upgrades
CVE-2026-445748.1 HIGHNext.js: Middleware / Proxy bypass through dynamic route parameter injection
CVE-2026-451097.5 HIGHNext.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
CVE-2026-445797.5 HIGHNext.js: Denial of Service via connection exhaustion in applications using Cache Component
CVE-2026-445737.5 HIGHNext.js: Middleware / Proxy bypass in Pages Router applications using i18n
CVE-2026-445806.1 MEDIUMNext.js: Cross-site scripting in beforeInteractive scripts with untrusted input
CVE-2026-445775.9 MEDIUMNext.js: Denial of Service in the Image Optimization API
CVE-2026-444795.5 MEDIUMVercel: Non-interactive mode includes CLI arguments in suggested command output
CVE-2026-445765.4 MEDIUMNext.js: Cache poisoning in React Server Component responses
CVE-2026-445814.7 MEDIUMNext.js: Cross-site scripting in App Router applications using CSP nonces
CVE-2026-445723.7 LOWNext.js: Middleware / Proxy redirects can be cache-poisoned
CVE-2026-445823.7 LOWNext.js: Cache poisoning via collisions in React Server Component cache-busting

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-288

V. Comments for CVE-2026-44575

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