React2Shell - RCE (CVE-2025-55182)

CVE-2025-55182 is a critical vulnerability 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.

CrowdSec has been tracking this vulnerability and its exploits since 4th of December 2025.

CrowdSec network data shows that most actors exploiting CVE-2025-55182 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2025-55182. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.

Attackers can exploit this vulnerability by sending specially crafted HTTP requests to Server Function endpoints in React Server Components. By manipulating the payloads, they can trigger unsafe deserialization, leading to remote code execution on the affected server without requiring authentication.