DoS in react-server-dom packages 19.0.0-19.2.4 via crafted HTTP
CVE-2026-23869 Published on April 8, 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.
Weakness Types
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2026-23869 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-23869 has been classified to as a Resource Exhaustion vulnerability or weakness.
Affected Versions
Meta react-server-dom-turbopack:- Version 19.0.0, <= 19.0.4 is affected.
- Version 19.1.0, <= 19.1.5 is affected.
- Version 19.2.0, <= 19.2.4 is affected.
- Version 19.0.0, <= 19.0.4 is affected.
- Version 19.1.0, <= 19.1.5 is affected.
- Version 19.2.0, <= 19.2.4 is affected.
- Version 19.0.0, <= 19.0.4 is affected.
- Version 19.1.0, <= 19.1.5 is affected.
- Version 19.2.0, <= 19.2.4 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.