CVE-2026-23864
January 26, 2026
Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack.
The vulnerabilities are triggered by sending specially crafted HTTP requests to Server Function endpoints, and could lead to server crashes, out-of-memory exceptions or excessive CPU usage; depending on the vulnerable code path being exercised, the application configuration and application code.
Strongly consider upgrading to the latest package versions to reduce risk and prevent availability issues in applications using React Server Components.
Affected Packages
react-server-dom-webpack (NPM):
Affected version(s) >=19.0.0 <19.0.4Fix Suggestion:
Update to version 19.0.4react-server-dom-parcel (NPM):
Affected version(s) >=19.2.0 <19.2.4Fix Suggestion:
Update to version 19.2.4react-server-dom-webpack (NPM):
Affected version(s) >=19.2.0 <19.2.4Fix Suggestion:
Update to version 19.2.4react-server-dom-webpack (NPM):
Affected version(s) >=19.2.0-canary-63779030-20250328 <19.2.4Fix Suggestion:
Update to version 19.2.4react-server-dom-webpack (NPM):
Affected version(s) >=19.1.0 <19.1.5Fix Suggestion:
Update to version 19.1.5react-server-dom-turbopack (NPM):
Affected version(s) >=19.1.0 <19.1.5Fix Suggestion:
Update to version 19.1.5react-server-dom-turbopack (NPM):
Affected version(s) >=19.0.0 <19.0.4Fix Suggestion:
Update to version 19.0.4react-server-dom-turbopack (NPM):
Affected version(s) >=19.2.0-canary-63779030-20250328 <19.2.4Fix Suggestion:
Update to version 19.2.4react-server-dom-parcel (NPM):
Affected version(s) >=19.2.0-canary-63779030-20250328 <19.2.4Fix Suggestion:
Update to version 19.2.4react-server-dom-turbopack (NPM):
Affected version(s) >=19.2.0 <19.2.4Fix Suggestion:
Update to version 19.2.4react-server-dom-webpack (NPM):
Affected version(s) >=19.1.0-canary-7130d0c6-20241212 <19.1.5Fix Suggestion:
Update to version 19.1.5react-server-dom-turbopack (NPM):
Affected version(s) >=19.1.0-canary-7130d0c6-20241212 <19.1.5Fix Suggestion:
Update to version 19.1.5react-server-dom-parcel (NPM):
Affected version(s) >=19.1.0 <19.1.5Fix Suggestion:
Update to version 19.1.5react-server-dom-parcel (NPM):
Affected version(s) >=19.1.0-canary-7130d0c6-20241212 <19.1.5Fix Suggestion:
Update to version 19.1.5Related Resources (5)
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:
1.40
