CVE-2026-23869
Published:April 08, 2026
Updated:April 20, 2026
A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.
Affected Packages
https://github.com/facebook/react.git (GITHUB):
Affected version(s) >=v19.0.0 <v19.0.5Fix Suggestion:
Update to version v19.0.5https://github.com/facebook/react.git (GITHUB):
Affected version(s) >=v19.2.0 <v19.2.5Fix Suggestion:
Update to version v19.2.5https://github.com/facebook/react.git (GITHUB):
Affected version(s) >=v19.1.0 <v19.1.6Fix Suggestion:
Update to version v19.1.6react-server-dom-turbopack (NPM):
Affected version(s) >=19.1.0 <19.1.6Fix Suggestion:
Update to version 19.1.6react-server-dom-turbopack (NPM):
Affected version(s) >=19.2.0 <19.2.5Fix Suggestion:
Update to version 19.2.5react-server-dom-parcel (NPM):
Affected version(s) >=19.2.0 <19.2.5Fix Suggestion:
Update to version 19.2.5react-server-dom-turbopack (NPM):
Affected version(s) >=19.0.0 <19.0.5Fix Suggestion:
Update to version 19.0.5react-server-dom-parcel (NPM):
Affected version(s) >=19.1.0 <19.1.6Fix Suggestion:
Update to version 19.1.6react-server-dom-webpack (NPM):
Affected version(s) >=19.0.0 <19.0.5Fix Suggestion:
Update to version 19.0.5react-server-dom-webpack (NPM):
Affected version(s) >=19.1.0 <19.1.6Fix Suggestion:
Update to version 19.1.6react-server-dom-webpack (NPM):
Affected version(s) >=19.2.0 <19.2.5Fix Suggestion:
Update to version 19.2.5Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
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
EPSS
Base Score:
0.32
