GHSA-8h8q-6873-q5fj: Next.js Vulnerable to Denial of Service with Server Components

May 11, 2026

A vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as CVE-2026-23870.

A specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.

References

github.com/advisories/GHSA-8h8q-6873-q5fj
github.com/facebook/react/security/advisories/GHSA-rv78-f8rc-xrxh
github.com/vercel/next.js/security/advisories/GHSA-8h8q-6873-q5fj
github.com/vitejs/vite-plugin-react/security/advisories/GHSA-w94c-4vhp-22gx
nvd.nist.gov/vuln/detail/CVE-2026-23870

Code Behaviors & Features

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