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CVE-2026-23869
A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and …
Impact
A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). 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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | react-server-dom-parcel | >= 19.0.0, < 19.0.5 | 19.0.5 |
| npm | react-server-dom-turbopack | >= 19.0.0, < 19.0.5 | 19.0.5 |
| npm | react-server-dom-webpack | >= 19.0.0, < 19.0.5 | 19.0.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-479c-33wc-g2pg
- https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg
- https://nvd.nist.gov/vuln/detail/CVE-2026-23869
- https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components
- https://access.redhat.com/security/cve/CVE-2026-23869
- https://bugzilla.redhat.com/show_bug.cgi?id=2456663
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23869.json