CVE-2026-64641
Published:July 27, 2026
Updated:August 04, 2026
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.
Affected Packages
https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v13.0.0 <v15.5.21Fix Suggestion:
Update to version v15.5.21https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v16.0.0 <v16.2.11Fix Suggestion:
Update to version v16.2.11next (NPM):
Affected version(s) >=13.0.0 <15.5.21Fix Suggestion:
Update to version 15.5.21next (NPM):
Affected version(s) >=16.0.0 <16.2.11Fix Suggestion:
Update to version 16.2.11Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Excessive Iteration
EPSS
Base Score:
0.60