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OpenAdvisories
High · 7.5 Public exploit CVE-2026-23869 EUVD-2026-20584GHSA-479c-33wc-g2pg

React Server Components have a Denial of Service Vulnerability

Published Apr 8, 2026 · Updated Jul 15, 2026 · Assigned by Meta

Vendor: Meta Product: react-server-dom-parcel Product: react-server-dom-turbopack Product: react-server-dom-webpack Package: react-server-dom-parcel Package: react-server-dom-turbopack Package: react-server-dom-webpack Ecosystem: npm

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.

Affected products

VendorProductAffectedFixed
Meta react-server-dom-turbopack 19.0.0 – ≤ 19.0.4, 19.1.0 – ≤ 19.1.5, 19.2.0 – ≤ 19.2.4 —
Meta react-server-dom-parcel 19.0.0 – ≤ 19.0.4, 19.1.0 – ≤ 19.1.5, 19.2.0 – ≤ 19.2.4 —
Meta react-server-dom-webpack 19.0.0 – ≤ 19.0.4, 19.1.0 – ≤ 19.1.5, 19.2.0 – ≤ 19.2.4 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 3 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
npm react-server-dom-parcel >= 19.0.0, < 19.0.5 19.0.5 GHSA-479c-33wc-g2pg
npm react-server-dom-parcel >= 19.1.0, < 19.1.6 19.1.6 GHSA-479c-33wc-g2pg
npm react-server-dom-parcel >= 19.2.0, < 19.2.5 19.2.5 GHSA-479c-33wc-g2pg
npm react-server-dom-turbopack >= 19.0.0, < 19.0.5 19.0.5 GHSA-479c-33wc-g2pg
npm react-server-dom-turbopack >= 19.1.0, < 19.1.6 19.1.6 GHSA-479c-33wc-g2pg
npm react-server-dom-turbopack >= 19.2.0, < 19.2.5 19.2.5 GHSA-479c-33wc-g2pg
npm react-server-dom-webpack >= 19.0.0, < 19.0.5 19.0.5 GHSA-479c-33wc-g2pg
npm react-server-dom-webpack >= 19.1.0, < 19.1.6 19.1.6 GHSA-479c-33wc-g2pg
npm react-server-dom-webpack >= 19.2.0, < 19.2.5 19.2.5 GHSA-479c-33wc-g2pg

Advisories 1

References