Deserialization in Facebook React
CVE-2025-67779
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.200 (97.4th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.203 · newest: 0.200 · change: -0.003
Affected products
- Facebook React — versions 19.0.2, 19.1.3, 19.2.2
- Meta React-Server-Dom-Parcel — versions 19.0.2, 19.1.3, 19.2.2
- Meta React-Server-Dom-Turbopack — versions 19.0.2, 19.1.3, 19.2.2
- Meta React-Server-Dom-Webpack — versions 19.0.2, 19.1.3, 19.2.2
- Vercel Next.js — versions 15.6.0, 16.1.0
Weakness classification (CWE)
References
- www.facebook.com/security/advisories/cve-2025-67779 (Vendor Advisory)
- react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-s… (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-67779?
- CVE-2025-67779 is a high-severity vulnerability in Facebook React, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2025-12-12.
- How severe is CVE-2025-67779?
- High severity. CVSS v3 base score is 7.5 out of 10.