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CVE-2026-64645— Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname

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.

Vercel Next.js是Vercel公司开源的一个 React 框架。 Vercel next.js 12.0.0版本至15.5.20版本和16.0.0版本至16.2.10版本存在安全漏洞，该漏洞源于rewrites()或redirects()规则从请求控制的输入中构建外部目标主机名，导致可指向任意主机名，从而造成服务端请求伪造和开放重定向。

CVSS 8.3 · High EPSS 0.41% · P33

Affected Version Matrix 2

VendorProduct Version RangeStatus
vercel next.js >= 12.0.0 < 15.5.21 affected
>= 16.0.0, < 16.2.11 affected
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I. Basic Information for CVE-2026-64645

Vulnerability Information
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Vulnerability Title
Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname
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, a rewrites() or redirects() rule that builds its external destination hostname from request-controlled input can be pointed at an arbitrary hostname, regardless of the rule's hostname suffix. For a rewrite, Next.js proxies the request to that arbitrary host and serves the response from the application's origin, leading to Server-Side Request forgery. A redirects() rule configured this way is vulnerable to an Open Redirect. 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:H/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Vercel next.js 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vercel Next.js是Vercel公司开源的一个 React 框架。 Vercel next.js 12.0.0版本至15.5.20版本和16.0.0版本至16.2.10版本存在安全漏洞，该漏洞源于rewrites()或redirects()规则从请求控制的输入中构建外部目标主机名，导致可指向任意主机名，从而造成服务端请求伪造和开放重定向。
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 >= 12.0.0 < 15.5.21 -

II. Public POCs for CVE-2026-64645

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III. Intelligence Information for CVE-2026-64645

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Patches & Fixes for CVE-2026-64645 (3)

Vendor Advisories for CVE-2026-64645 (1)

Vendor Pages for CVE-2026-64645 (1)

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

CVE-2026-64642 8.3 HIGH Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single l
CVE-2026-64649 8.3 HIGH Next.js: Server-Side Request Forgery in Server Actions on Custom Servers
CVE-2026-64641 8.2 HIGH Next.js: Denial of Service in App Router using Server Actions
CVE-2026-64643 6.3 MEDIUM Next.js: Unauthenticated Disclosure of Internal Server Function endpoints
CVE-2026-64644 6.3 MEDIUM Next.js: Denial of Service in the Image Optimization API using SVGs
CVE-2026-64646 6.3 MEDIUM Next.js: Unbounded Server Action payload in Edge runtime
CVE-2026-64647 6.3 MEDIUM Next.js: Response Body Cache Confusion with Invalid UTF-8 Request Bodies
CVE-2026-64648 6.0 MEDIUM Next.js: Response Body Cache Confusion for Requests Containing Bodies

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-918

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