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

BOD 26-04 remediation window

With CISA's SSVC answers for this CVE (automatable: yes, technical impact: total), BOD 26-04 Table 1 gives 3 days and forensic triage on a publicly exposed asset (row 1) and 3 days and forensic triage on an asset that is not publicly exposed (row 9) ^S06. The catalogue due date, 7 days after the date added, was set before BOD 26-04 took effect on 10 June 2026 ^S06. The directive binds US federal civilian executive branch agencies only.

What CISA says

Short 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

CWE in the catalogue

Not provided by source

Official links

• CISA KEV catalogue entry cisa.gov
• NVD record nvd.nist.gov

Vendor advisory and patch links

References NVD tags Vendor Advisory or Patch, exactly as NVD lists them.

• https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components Patch, Vendor Advisory
• https://www.facebook.com/security/advisories/cve-2025-55182 Vendor Advisory
• http://www.openwall.com/lists/oss-security/2025/12/03/4 Mailing List, Patch, Third Party Advisory

Links in CISA's notes

• 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

NVD details

CWE (NVD)

CWE-502 by nvd@nist.gov

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS versions in NVD

V31

Last modified in NVD

2026-10-18T17:10:00.110

Where each value comes from

This product uses data from the NVD API but is not endorsed or certified by the NVD. CISA does not endorse Sysprobs. Methodology.