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CVE-2026-126187: Next.js React Flight RCE

React Server Components Just Got an Unauthenticated RCE: Breaking Down CVE-2026-126187

The CyberSec Guru

CVE-2026-126187 is a 9.5 CVSS unauthenticated RCE in React Server Components. See how a detached buffer and forged thenable break Next.js Cache Components