Critical React Server Components Flaws in 2025 Enable DoS and Code Leaks
In December 2025, several critical vulnerabilities were discovered in React Server Components (RSC), affecting core packages such as react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. Identified as CVE-2025-55184, CVE-2025-67779, and CVE-2025-55183, these flaws were exploited by attackers to perform pre-authentication denial-of-service (DoS) attacks and, in some cases, access sensitive server-side source code. Exploitation was enabled through unsafe deserialization of HTTP payloads, leading to server hangs, or via crafted requests that exposed function source code. The vulnerabilities impacted RSC versions 19.0.0 through 19.2.2 and were identified following active investigation by security researchers in the wake of CVE-2025-55182 exploitation in the wild. This incident underscores the growing trend of adversaries targeting server-side JavaScript frameworks through exploitation chains and rapid patch circumvention. Organizations relying on React for server-side rendering must remain vigilant, as repeated disclosures highlight both the software supply chain's fragility and the need for rigorous update cycles to fend off evolving threats.
Kill Chain