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CVE-2026-64641— Next.js: Denial of Service in App Router using Server Actions

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 是一个用于构建全栈 Web 应用的 React 框架。在版本 13.0.0 至 15.5.20，以及 16.0.0 至 16.2.10 中，针对使用了 App Router 且至少包含一个 Server Action 的 Next.js 应用发送精心构造的请求，可能导致 CPU 使用率过高，从而阻塞同一进程内后续请求的处理。该问题已在版本 15.5.21 和 16.2.11 中修复。

CVSS 8.2 · High EPSS 1.38% · P71

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
vercel next.js >= 13.0.0, < 15.5.21 affected
>= 16.0.0, < 16.2.11 affected
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I. Basic Information for CVE-2026-64641

Vulnerability Information
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Vulnerability Title
Next.js: Denial of Service in App Router using Server Actions
Source: CVE Program / CVE List V5
Vulnerability Description
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 through 16.2.10, crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. 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:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
过度迭代
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vercel next.js >= 13.0.0, < 15.5.21 -

II. Public POCs for CVE-2026-64641

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III. Intelligence Information for CVE-2026-64641

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Patches & Fixes for CVE-2026-64641 (2)

Vendor Advisories for CVE-2026-64641 (1)

Vendor Pages for CVE-2026-64641 (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-2026-64645 8.3 HIGH Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostn
CVE-2026-64649 8.3 HIGH Next.js: Server-Side Request Forgery in Server Actions on Custom Servers
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-834

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