CVE-2026-23864 — Vulnerability in react-server-dom-turbopack — CVE...

HIGH

React Server Components have multiple Denial of Service Vulnerabilities

Published January 29, 2026Updated February 3, 2026Source: osv

Summary

## Impact It was found that the fixes to address DoS in React Server Components were incomplete and we found multiple denial of service vulnerabilities still exist in React Server Components. We recommend updating immediately. The vulnerability exists in versions 19.0.0, 19.0.1, 19.0.2, 19.0.3, 19.1.0, 19.1.1, 19.1.2, 19.1.3, 19.1.4, 19.2.0, 19.2.1, 19.2.2, 19.2.3 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) 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. ## Patches Fixes were back ported to versions 19.0.4, 19.1.5, and 19.2.4. 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 January 29, 2026 (256 days ago).
Last revised February 3, 2026 — 5 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update react-server-dom-turbopack to 19.2.4 or later

npm install react-server-dom-turbopack@19.2.4

npm

Update react-server-dom-parcel to 19.0.4 or later

npm install react-server-dom-parcel@19.0.4

npm

Update react-server-dom-webpack to 19.2.4 or later

npm install react-server-dom-webpack@19.2.4

npm

Update react-server-dom-turbopack to 19.0.4 or later

npm install react-server-dom-turbopack@19.0.4

npm

Update react-server-dom-parcel to 19.2.4 or later

npm install react-server-dom-parcel@19.2.4

npm

Update react-server-dom-webpack to 19.1.5 or later

npm install react-server-dom-webpack@19.1.5

npm

Update react-server-dom-parcel to 19.1.5 or later

npm install react-server-dom-parcel@19.1.5

npm

Update react-server-dom-webpack to 19.0.4 or later

npm install react-server-dom-webpack@19.0.4

npm

Update react-server-dom-turbopack to 19.1.5 or later

npm install react-server-dom-turbopack@19.1.5

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	19.2.4
react-server-dom-parcel	npm	All versions	19.0.4
react-server-dom-webpack	npm	All versions	19.2.4
react-server-dom-turbopack	npm	All versions	19.0.4
react-server-dom-parcel	npm	All versions	19.2.4
react-server-dom-webpack	npm	All versions	19.1.5
react-server-dom-parcel	npm	All versions	19.1.5
react-server-dom-webpack	npm	All versions	19.0.4
react-server-dom-turbopack	npm	All versions	19.1.5

Vulnerability Classification

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

CWE-400
Uncontrolled Resource ConsumptionMITRE

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-2026-23864?: React Server Components have multiple Denial of Service Vulnerabilities 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-2026-23864?: CVE-2026-23864 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-2026-23864 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-83fc-fqcc-2hmg

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