React Server Components have multiple Denial of Service Vulnerabilities
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:
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 for more information and upgrade instructions.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | react-server-dom-parcel | >= 19.0.0, < 19.0.4, >= 19.1.0-canary-7130d0c6-20241212, < 19.1.5, >= 19.2.0-canary-63779030-20250328, < 19.2.4 | 19.0.4, 19.1.5, 19.2.4 |
| npm package | react-server-dom-turbopack | >= 19.1.0-canary-7130d0c6-20241212, < 19.1.5, >= 19.0.0, < 19.0.4, >= 19.2.0-canary-63779030-20250328, < 19.2.4 | 19.1.5, 19.0.4, 19.2.4 |
| npm package | react-server-dom-webpack | >= 19.2.0-canary-63779030-20250328, < 19.2.4, >= 19.1.0-canary-7130d0c6-20241212, < 19.1.5, >= 19.0.0, < 19.0.4 | 19.2.4, 19.1.5, 19.0.4 |
References
- https://github.com/facebook/react/security/advisories/GHSA-83fc-fqcc-2hmg
- https://nvd.nist.gov/vuln/detail/CVE-2026-23864
- https://github.com/facebook/react
- https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components
- https://www.facebook.com/security/advisories/cve-2026-23864
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400- Platform
- npm
- Package
react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack- Disclosed
- 29.01.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-83fc-fqcc-2hmg - CC BY 4.0
Vulnerability history: react-server-dom-turbopack
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 12.2025 07.2026
- Without a fix
- 0
- Exploited in attacks
- 1
Severity breakdown
- Critical 1
- High 6
- Medium 1
Disclosures per year
- 2025: 4
- 2026: 4
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React Server Components have multiple Denial of Service Vulnerabilities this entry
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