CVE-2026-23869 — Vulnerability in react-server-dom-turbopack — CVE...

HIGH

React Server Components have a Denial of Service Vulnerability

Published April 10, 2026Updated April 10, 2026Source: osv

Summary

## Impact A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack versions 19.0.0, 19.1.0 and 19.2.0. 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. We recommend updating immediately. The vulnerability exists in versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4 of: [react-server-dom-webpack](https://www.npmjs.com/package/react-server-dom-webpack) [react-server-dom-parcel](https://www.npmjs.com/package/react-server-dom-parcel) [react-server-dom-turbopack](https://www.npmjs.com/package/react-server-dom-turbopack?activeTab=readme) ## Patches Fixes were back ported to versions 19.0.5, 19.1.6, and 19.2.5. If you are using any of the above packages please upgrade to any of the fixed versions immediately. If your app’s React code does not use a server, your app is not affected by this vulnerability. If your app does not use a framework, bundler, or bundler plugin that supports React Server Components, your app is not affected by this vulnerability. ## References See the [blog post](https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components) for more information and upgrade instructions.

Advisory Timeline

First published April 10, 2026 (185 days ago).
Last revised April 10, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update react-server-dom-turbopack to 19.2.5 or later

npm install react-server-dom-turbopack@19.2.5

npm

Update react-server-dom-turbopack to 19.1.6 or later

npm install react-server-dom-turbopack@19.1.6

npm

Update react-server-dom-parcel to 19.2.5 or later

npm install react-server-dom-parcel@19.2.5

npm

Update react-server-dom-parcel to 19.1.6 or later

npm install react-server-dom-parcel@19.1.6

npm

Update react-server-dom-parcel to 19.0.5 or later

npm install react-server-dom-parcel@19.0.5

npm

Update react-server-dom-turbopack to 19.0.5 or later

npm install react-server-dom-turbopack@19.0.5

npm

Update react-server-dom-webpack to 19.0.5 or later

npm install react-server-dom-webpack@19.0.5

npm

Update react-server-dom-webpack to 19.2.5 or later

npm install react-server-dom-webpack@19.2.5

npm

Update react-server-dom-webpack to 19.1.6 or later

npm install react-server-dom-webpack@19.1.6

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (9)

Affects 1 ecosystem: npm (3).

Package	Ecosystem	Affected	Fixed In
react-server-dom-turbopack	npm	All versions	19.2.5
react-server-dom-turbopack	npm	All versions	19.1.6
react-server-dom-parcel	npm	All versions	19.2.5
react-server-dom-parcel	npm	All versions	19.1.6
react-server-dom-parcel	npm	All versions	19.0.5
react-server-dom-turbopack	npm	All versions	19.0.5
react-server-dom-webpack	npm	All versions	19.0.5
react-server-dom-webpack	npm	All versions	19.2.5
react-server-dom-webpack	npm	All versions	19.1.6

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-400
Uncontrolled Resource ConsumptionMITRE
CWE-502
Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Frequently Asked Questions

What is CVE-2026-23869?: React Server Components have a Denial of Service Vulnerability This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-23869?: CVE-2026-23869 affects react-server-dom-turbopack, react-server-dom-parcel and react-server-dom-webpack. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-23869 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-479c-33wc-g2pg

Related CVEs

CVE-2025-55182
CRITICAL
React Server Components are Vulnerable to RCE
CVE-2025-55184
HIGH
Denial of Service Vulnerability in React Server Components
CVE-2025-67779
HIGH
Denial of Service Vulnerability in React Server Components
CVE-2026-23864
HIGH
React Server Components have multiple Denial of Service Vulnerabilities
CVE-2026-107375
HIGH
JHipster: SQL Injection in the Parameter of JHipster-Generated Reactive (WebFlux + R2DBC) Applicationssort
CVE-2026-23870
HIGH
Facebook React has a Denial of Service Vulnerability in React Server Components
CVE-2026-107384
HIGH
MariaDB Connector/Node.js: SQL injection through object keys in SET expansion (permitSetMultiParamEntries)
CVE-2026-44907
HIGH
react-server-dom: Denial of Service in Server Functions

Check if you're affected

Scan your dependencies to see if this vulnerability affects your projects.

Scan Your Dependencies