What is CVE-2025-55184?

CVE-2025-55184 is a high-severity vulnerability in Facebook React, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2025-12-11.

How severe is CVE-2025-55184?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-55184 known to be exploited?

12 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Facebook React

CVE-2025-55184

A pre-authentication denial of service vulnerability exists in React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.

Vulnerability class: Insecure Deserialization

Published 2025-12-11 · last modified 2026-10-07.

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: 0.669 (99.3th percentile), scored 2026-10-20.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.669 · newest: 0.669 · change: 0.000

Affected products

Facebook React
Meta React-Server-Dom-Parcel — versions 19.0.0, 19.1.0, 19.2.0
Meta React-Server-Dom-Turbopack — versions 19.0.0, 19.1.0, 19.2.0
Meta React-Server-Dom-Webpack — versions 19.0.0, 19.1.0, 19.2.0
Vercel Next.js — versions 15.6.0, 16.1.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

www.facebook.com/security/advisories/cve-2025-55184 (Vendor Advisory)
react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-s… (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0

Frequently asked questions

What is CVE-2025-55184?: CVE-2025-55184 is a high-severity vulnerability in Facebook React, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2025-12-11.
How severe is CVE-2025-55184?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-55184 known to be exploited?: 12 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.