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CVE-2026-44572— Next.js: Middleware / Proxy redirects can be cache-poisoned

Quick assessment

Affected
vercel next.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Next.js是Vercel开源的一个 React 框架。 Next.js 12.2.0至15.5.16之前版本和16.2.5之前版本存在安全漏洞，该漏洞源于外部客户端可在由返回重定向的中间件处理的正常请求上发送x-nextjs-data标头，可能导致后续访问者收到无Location标头的缓存重定向响应，造成拒绝服务。

CVSS 3.7 · Low EPSS 0.28% · P21

Affected Version Matrix 2

VendorProduct Version RangeStatus
vercel next.js >= 12.2.0, < 15.5.16 affected
>= 16.0.0, < 16.2.5 affected
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I. Basic Information for CVE-2026-44572

Vulnerability Information
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Vulnerability Title
Next.js: Middleware / Proxy redirects can be cache-poisoned
Source: CVE Program / CVE List V5
Vulnerability Description
Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data request and replace the standard Location redirect header with the internal x-nextjs-redirect header. Browsers do not follow x-nextjs-redirect, so the response became an unusable redirect for normal clients. If the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a Location header, causing a denial of service for that redirect path until the cache entry expired or was purged. This vulnerability is fixed in 15.5.16 and 16.2.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在可信数据中接受外来的不可信数据
Source: CVE Program / CVE List V5
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 12.2.0至15.5.16之前版本和16.2.5之前版本存在安全漏洞，该漏洞源于外部客户端可在由返回重定向的中间件处理的正常请求上发送x-nextjs-data标头，可能导致后续访问者收到无Location标头的缓存重定向响应，造成拒绝服务。
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

Vendor Product Affected Versions CPE Subscribe
vercel next.js >= 12.2.0, < 15.5.16 -

II. Public POCs for CVE-2026-44572

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III. Intelligence Information for CVE-2026-44572

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Vendor Advisories for CVE-2026-44572 (1)

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

CVE-2026-44578 8.6 HIGH Next.js: Server-side request forgery in applications using WebSocket upgrades
CVE-2026-44574 8.1 HIGH Next.js: Middleware / Proxy bypass through dynamic route parameter injection
CVE-2026-45109 7.5 HIGH Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
CVE-2026-44579 7.5 HIGH Next.js: Denial of Service via connection exhaustion in applications using Cache Component
CVE-2026-44575 7.5 HIGH Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
CVE-2026-44573 7.5 HIGH Next.js: Middleware / Proxy bypass in Pages Router applications using i18n
CVE-2026-44580 6.1 MEDIUM Next.js: Cross-site scripting in beforeInteractive scripts with untrusted input
CVE-2026-44577 5.9 MEDIUM Next.js: Denial of Service in the Image Optimization API
CVE-2026-44479 5.5 MEDIUM Vercel: Non-interactive mode includes CLI arguments in suggested command output
CVE-2026-44576 5.4 MEDIUM Next.js: Cache poisoning in React Server Component responses
CVE-2026-44581 4.7 MEDIUM Next.js: Cross-site scripting in App Router applications using CSP nonces
CVE-2026-44582 3.7 LOW Next.js: Cache poisoning via collisions in React Server Component cache-busting

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-349

V. Comments for CVE-2026-44572

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