Meta · React Server Components

CVE-2025-55182

Meta React Server Components Remote Code Execution Vulnerability

CISA KEV record

CISA date added: 2025-12-05
CISA due date: 2025-12-12
Known ransomware use: Known

NVD risk context

10.0 CRITICAL

CVSS is a technical severity score. CISA’s KEV status remains the evidence that this vulnerability is known to be exploited.

View NVD record ↗

Attack vector

Network

The vulnerable service can be reached remotely over a network.

Attack complexity

Low

Exploitation does not require unusual conditions beyond normal attacker control.

Privileges required

None

The attacker does not need an existing account or privileges.

User interaction

None

No action by another user is required.

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.

NVD reference index

Vendor and remediation references

NVD has tagged these sources as vendor advisories, patches, mitigations, or release notes.

https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components ↗
PatchVendor Advisory NVD reference source: cve-assign@fb.com · Also linked in CISA notes
https://www.facebook.com/security/advisories/cve-2025-55182 ↗
Vendor Advisory NVD reference source: cve-assign@fb.com
http://www.openwall.com/lists/oss-security/2025/12/03/4 ↗
Mailing ListPatchThird Party Advisory NVD reference source: af854a3a-2127-422b-91ae-364da2661108

Other NVD references (3)

https://news.ycombinator.com/item?id=46136026 ↗
Issue Tracking NVD reference source: af854a3a-2127-422b-91ae-364da2661108
https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/ ↗
Third Party Advisory NVD reference source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182 ↗
US Government Resource NVD reference source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

MITRE CWE context

CWE classification

CISA has not listed a CWE classification for this entry.

NVD record timing

NVD record timeline

These dates describe NVD’s record, not CISA’s KEV addition or remediation due date.

NVD published: Dec 03, 2025, 04:15 PM UTC
NVD last updated: Jun 17, 2026, 09:41 AM UTC

Advanced: view the technical CVSS vector

This standardized code is intended for security tools and technical analysts. The plain-language risk summary above explains its main points.

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

View NVD record ↗

CISA 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