CVE-2025-55182—Meta React Server Components Remote Code Execution Vulnerability

Vulnerability Name

Meta React Server Components Remote Code Execution Vulnerability

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

KNOWN

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.

Additional 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

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