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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
NVD MITRE
EPSS Score
0.6%
Top 54.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
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
View detailed technique mapping

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
1

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