CVE-2026-64641

Next.js: Denial of Service in App Router using Server Actions

Published: Jul 27, 2026Updated: Jul 29, 2026 Sources: CVE List NVDCWE-834

7.5HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-834

Affected Products

vercel

commercial·US

next.jsLibraryLibrary

OSS Libraries / web-framework

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://github.com/vercel/next.js/security/advisories/GHSA-m99w-x7hq-7vfj

github.com

https://github.com/vercel/next.js/pull/96013

github.com

https://github.com/vercel/next.js/commit/019628571641dec57aaf349ba0c360e3964e6f12

github.com

and 2 more references View all →

News mentions

⚡ Weekly Recap: Rogue AI Models, $88M Bitcoin Theft, Water-System Attacks and Dangling DNS Hijacks
en·The Hacker News·Aug 3, 2026 Exploited Coldcard Wallet Laundry Bear

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