CVE-2025-55182 KEV EXPLOIT
10.0
CRITICAL · CVSS 3.1 · EPSS 99.8% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2025-12-12.
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.
Scoring
| CVSS | 10.0 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 99.8% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-502 |
| On CISA KEV | yes — remediate by 2025-12-12 |
| Public exploit | yes |
| Published | 2025-12-03 |
| Last modified | 2026-08-04 |
CISA KEV
| Name | Meta React Server Components Remote Code Execution Vulnerability |
|---|---|
| Added | 2025-12-05 |
| Due | 2025-12-12 |
| Vendor / product | Meta / React Server Components |
| Ransomware use | known |
Affected (2)
| Vendor | Product |
|---|---|
| react | |
| vercel | next.js |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | React Server 19.2.0 - Remote Code Execution | 2026-04-09 |
References
- https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components
- https://www.facebook.com/security/advisories/cve-2025-55182
- http://www.openwall.com/lists/oss-security/2025/12/03/4
- https://news.ycombinator.com/item?id=46136026
- https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182
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