WS-2026-0160
Published:October 14, 2026
Updated:October 22, 2026
next 13.3.1 through 15.5.27 and 16.0.0 through 16.4.0: crafted Server Action requests cause excessive CPU use in the bundled React Server Components reply decoder, blocking further requests in the same process (GHSA-p3m5-59mp-jv5r)
Affected Packages
https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v15.0.0 <v15.5.28Fix Suggestion:
Update to version v15.5.28https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v16.0.0 <v16.4.1Fix Suggestion:
Update to version v16.4.1next (NPM):
Affected version(s) >=16.0.0 <16.4.1Fix Suggestion:
Update to version 16.4.1next (NPM):
Affected version(s) >=15.0.0 <15.5.28Fix Suggestion:
Update to version 15.5.28Related Resources (5)
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:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Algorithmic Complexity