CVE-2025-67779

HIGH

Facebook React < 14.2.35 - Insecure Deserialization

Title source: rule

Description

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.

Exploits (1)

github WORKING POC

by JSH-data · pythonpoc

https://github.com/JSH-data/CVE-2025-55184_CVE-2025-67779

View Code ZIP pw:eip

References (2)

[Vendor Advisory] https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components

[Vendor Advisory] https://www.facebook.com/security/advisories/cve-2025-67779

Scores

CVSS v3 7.5

EPSS 0.0012

EPSS Percentile 30.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

CWE

CWE-502 CWE-400

Status published

Affected Products (50)

facebook/react

vercel/next.js < 14.2.35

vercel/next.js

... and 35 more

Timeline

Published Dec 12, 2025

Tracked Since Feb 18, 2026