CVE-2026-23864: React Server Components have multiple Denial of Service Vulnerabilities
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.
References
- github.com/advisories/GHSA-83fc-fqcc-2hmg
- github.com/facebook/react
- github.com/facebook/react/security/advisories/GHSA-83fc-fqcc-2hmg
- nvd.nist.gov/vuln/detail/CVE-2026-23864
- react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components
- www.facebook.com/security/advisories/cve-2026-23864
Code Behaviors & Features
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