CVE-2025-55182
Critical 10.0 Exploited in the wild (KEV) Used in ransomware campaigns
Confirmed active exploitation — CISA KEV catalog
- Name
- Meta React Server Components Remote Code Execution Vulnerability
- Added to catalog
- Remediation due date (US federal)
- 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.
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.
Metrics
- CVSS 3.1
-
10.0 (CRITICAL)
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 100% (percentile: 100) as of 1 November 2026
- CWE
- CWE-502
Affected products
facebook: react; vercel: next.js
References
- https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-serv… PatchVendor Advisory
- https://www.facebook.com/security/advisories/cve-2025-55182 Vendor Advisory
- http://www.openwall.com/lists/oss-security/2025/12/03/4 Mailing ListPatchThird Party Advisory
- https://news.ycombinator.com/item?id=46136026 Issue Tracking
- https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-e… Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025… US Government Resource