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CVE-2026-23870 — Vulnerability in react-server-dom-webpack — CVE...

HIGH

Facebook React has a Denial of Service Vulnerability in React Server Components

Published May 11, 2026Updated May 11, 2026Source: osv

Summary

## Impact A denial of service vulnerability could be triggered by sending specially crafted HTTP requests to server function endpoints, this could lead to out-of-memory exceptions or excessive CPU usage. We recommend updating immediately. The vulnerability exists in versions 19.0.0 through 19.0.5, 19.1.0 through 19.1.6, and 19.2.0 through 19.2.5 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 19.0.6, 19.1.7, and 19.2.6. 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 May 11, 2026 (154 days ago).
  • Last revised May 11, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update react-server-dom-webpack to 19.2.6 or later
npm install react-server-dom-webpack@19.2.6
npm
Update react-server-dom-parcel to 19.2.6 or later
npm install react-server-dom-parcel@19.2.6
npm
Update react-server-dom-turbopack to 19.0.6 or later
npm install react-server-dom-turbopack@19.0.6
npm
Update react-server-dom-webpack to 19.1.7 or later
npm install react-server-dom-webpack@19.1.7
npm
Update react-server-dom-turbopack to 19.2.6 or later
npm install react-server-dom-turbopack@19.2.6
npm
Update react-server-dom-parcel to 19.1.7 or later
npm install react-server-dom-parcel@19.1.7
npm
Update react-server-dom-parcel to 19.0.6 or later
npm install react-server-dom-parcel@19.0.6
npm
Update react-server-dom-webpack to 19.0.6 or later
npm install react-server-dom-webpack@19.0.6
npm
Update react-server-dom-turbopack to 19.1.7 or later
npm install react-server-dom-turbopack@19.1.7

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

Affected Packages (9)

Affects 1 ecosystem: npm (3).

PackageEcosystemAffectedFixed In
react-server-dom-webpack
npm
All versions19.2.6
react-server-dom-parcel
npm
All versions19.2.6
react-server-dom-turbopack
npm
All versions19.0.6
react-server-dom-webpack
npm
All versions19.1.7
react-server-dom-turbopack
npm
All versions19.2.6
react-server-dom-parcel
npm
All versions19.1.7
react-server-dom-parcel
npm
All versions19.0.6
react-server-dom-webpack
npm
All versions19.0.6
react-server-dom-turbopack
npm
All versions19.1.7

Vulnerability Classification

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

  • CWE-400
    Uncontrolled Resource ConsumptionMITRE
  • CWE-770
    Allocation of Resources Without LimitsMITRE

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-2026-23870?
Facebook React has a Denial of Service Vulnerability in React Server Components 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-2026-23870?
CVE-2026-23870 affects react-server-dom-webpack, react-server-dom-parcel and react-server-dom-turbopack. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-23870 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-rv78-f8rc-xrxh

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