What is CVE-2025-55182?

CVE-2025-55182 is a critical-severity vulnerability in Facebook React, classified under Deserialization of Untrusted Data. CVSS score: 10.0/10. Published 2025-12-03.

How severe is CVE-2025-55182?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Is CVE-2025-55182 known to be exploited?

Yes. CVE-2025-55182 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-05), indicating it is being actively exploited. 519 public proof-of-concept repositories are indexed.

Deserialization in Facebook React

CVE-2025-55182

A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 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.

Vulnerability class: Insecure Deserialization

Published 2025-12-03 · last modified 2026-10-18.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.998 (100.0th percentile), scored 2026-10-18.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.998 · newest: 0.998 · change: 0.000

Affected products

Facebook React — versions 19.0.0, 19.1.0, 19.1.1
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 14.3.0, 15.6.0, 16.0.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-12-05. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-12-12.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

www.facebook.com/security/advisories/cve-2025-55182 (Vendor Advisory)
react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-compo… (Patch, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Patch, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Issue Tracking)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2025-55182?: CVE-2025-55182 is a critical-severity vulnerability in Facebook React, classified under Deserialization of Untrusted Data. CVSS score: 10.0/10. Published 2025-12-03.
How severe is CVE-2025-55182?: Critical severity. CVSS v3 base score is 10.0 out of 10.
Is CVE-2025-55182 known to be exploited?: Yes. CVE-2025-55182 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-05), indicating it is being actively exploited. 519 public proof-of-concept repositories are indexed.