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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
vercel next.js affected
Version Status Constraints
>= 13.0.0 < 15.5.21 affected —
>= 16.0.0, < 16.2.11 affected —

No data.

No data.

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Vendors Products
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Next.js Subscribe

Project Subscriptions

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Next.js Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-4c39-4ccg-62r3 Next.js: Unbounded Server Action payload in Edge runtime
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/vercel/next.js/commit/57c31f724d746e86a9e8b92aa8be538a922446a4 cve-icon
https://github.com/vercel/next.js/commit/9a4651e754f70b12e397694ffc41f44c3ba8cc17 cve-icon
https://github.com/vercel/next.js/releases/tag/v15.5.21 cve-icon
https://github.com/vercel/next.js/releases/tag/v16.2.11 cve-icon
https://github.com/vercel/next.js/security/advisories/GHSA-4c39-4ccg-62r3 cve-icon
History

Tue, 28 Jul 2026 01:00:00 +0000

Type Values Removed Values Added
First Time appeared Vercel
Vercel next.js
Vendors & Products Vercel
Vercel next.js

Mon, 27 Jul 2026 23:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 27 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title Next.js: Unbounded Server Action payload in Edge runtime
Weaknesses CWE-770
References
Metrics cvssV4_0

{'score': 6.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-27T20:22:18.086Z

Reserved: 2026-07-20T17:11:30.895Z

Link: CVE-2026-64646

cve-icon Vulnrichment

Updated: 2026-07-27T20:22:14.094Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-28T00:45:02Z

Weaknesses