CVE WatchOct 8, 2026

CVE-2025-55182

Meta React Server Components Remote Code Execution Vulnerability

CVSS

10.0

Critical

EPSS

99.8%

p100

KEV

YES

Dec 5, 2025

Exploit Today

0-100

Published: Dec 3, 2025 · Last modified: Oct 8, 2026 · CWE-502

EPSS · 30d

99.8%EPSS · 30 days99.8%

2026-09-162026-10-14

KEV catalog record

Product

Meta / React Server Components

Vulnerability

Meta React Server Components Remote Code Execution Vulnerability

Added to KEV

Dec 5, 2025

Remediate by

Dec 12, 2025

Known ransomware use

Yes

Summary description

Meta React Server Components contains a remote code execution vulnerability that could allow unauthenticated remote code execution by exploiting a flaw in how React decodes payloads sent to React Server Function endpoints. Please note CVE-2025-66478 has been rejected, but it is associated with CVE-2025- 55182.

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.

Notes

Check for signs of potential compromise on all internet accessible REACT instances after applying mitigations. For more information, please see: https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components ; https://github.com/vercel-labs/fix-react2shell-next?tab=readme-ov-file ; https://nvd.nist.gov/vuln/detail/CVE-2025-55182

Technical description

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.

Official references

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