React Server Function - 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. Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2025-55182 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2025-55182 is currently experiencing high visibility and active exploitation across the internet.

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.