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CVE-2026-64646— Next.js: Unbounded Server Action payload in Edge runtime

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 13.0.0版本至15.5.20版本和16.0.0版本至16.2.10版本存在资源管理错误漏洞，该漏洞源于使用App Router和Server Action时，请求导致过度内存消耗。

CVSS 6.3 · Medium EPSS 0.52% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

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-2026-64646

Vulnerability Information
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Vulnerability Title
Next.js: Unbounded Server Action payload in Edge runtime
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, requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive memory consumption if that Server Actions uses the Edge runtime. 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:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Vercel Next.js 资源管理错误漏洞
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 13.0.0版本至15.5.20版本和16.0.0版本至16.2.10版本存在资源管理错误漏洞，该漏洞源于使用App Router和Server Action时，请求导致过度内存消耗。
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 >= 13.0.0 < 15.5.21 -

II. Public POCs for CVE-2026-64646

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III. Intelligence Information for CVE-2026-64646

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Patches & Fixes for CVE-2026-64646 (3)

Vendor Advisories for CVE-2026-64646 (1)

Vendor Pages for CVE-2026-64646 (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-2026-64641 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-2026-64647 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-770