CVE-2026-23869
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability75. percentile1.6%
ProductReact-server-dom-parcel
PublishedApr 8, 2026
First seenApr 8, 2026
How to fix
Update
- react-server-dom-parcel19.0.5, 19.1.6, 19.2.5 or later
- react-server-dom-turbopack19.0.5, 19.1.6, 19.2.5 or later
- react-server-dom-webpack19.0.5, 19.1.6, 19.2.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| react-server-dom-parcelnpm | 19.0.0 ≤ v < 19.0.5, 19.1.0 ≤ v < 19.1.6, 19.2.0 ≤ v < 19.2.5 | 19.0.5, 19.1.6, 19.2.5 |
| react-server-dom-turbopacknpm | 19.0.0 ≤ v < 19.0.5, 19.1.0 ≤ v < 19.1.6, 19.2.0 ≤ v < 19.2.5 | 19.0.5, 19.1.6, 19.2.5 |
| react-server-dom-webpacknpm | 19.0.0 ≤ v < 19.0.5, 19.1.0 ≤ v < 19.1.6, 19.2.0 ≤ v < 19.2.5 | 19.0.5, 19.1.6, 19.2.5 |
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