CVE-2025-67779: Facebook React

High severity, CVSS 7.5. EPSS: 20% chance of exploitation in the next 30 days.

It was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service attack in a specific case. React Server Components versions 19.0.2, 19.1.3 and 19.2.2 are affected, allowing unsafe deserialization of payloads from HTTP requests to Server Function endpoints. This can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.

Affected products

• Facebook React: version 19.0.2 only; version 19.1.3 only; version 19.2.2 only
• Vercel Next.js: from 13.3.0, before 14.2.35 (fixed in 14.2.35); from 15.0.0, before 15.0.7 (fixed in 15.0.7); from 15.1.0, before 15.1.11 (fixed in 15.1.11); from 15.2.0, before 15.2.8 (fixed in 15.2.8); from 15.3.0, before 15.3.8 (fixed in 15.3.8); from 15.4.0, before 15.4.10 (fixed in 15.4.10); …

Published 2025-12-12. Last modified 2026-10-07.