CVE-2025-55183
MediumCVSS 5.3Exploitation Probability (EPSS)
Very high risk99th percentile - higher than 99% of all known CVEs
Summary
An information leak vulnerability exists in specific configurations of React Server Components versions 19.0.0, 19.0.1, 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the packages react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. A specifically crafted HTTP request sent to a vulnerable Server Function may unsafely return the source code of any Server Function.
Risk Assessment
An attacker may obtain the source code of Server Functions, potentially exposing application logic and sensitive data. Exploitation requires a Server Function that explicitly or implicitly exposes a stringified argument.
Recommendation
Upgrade React Server Components to a patched version and review Server Functions for exposure of stringified arguments.
Other vulnerabilities in React Server Components
See all- CVE-2025-67779High
Vulnerability in React Server Components versions 19.0.2, 19.1.3 and 19.2.2 is an incomplete fix for CVE-2025-55184 and still allows unsafe deserialization of payloads from HTTP requests to Server Function endpoints, causing an infinite loop that hangs the server process.
- CVE-2025-55184High
Pre-authentication denial of service vulnerability in React Server Components versions 19.0.0, 19.0.1, 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack, allows unsafe deserialization of payloads from HTTP requests to Server Function endpoints, causing an infinite loop that hangs the server process.
- CVE-2025-55182CriticalActively exploited
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 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.
- CVE-2026-23869High
A denial of service vulnerability in React Server Components (react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack) versions 19.0.0-19.0.4, 19.1.0-19.1.5, and 19.2.0-19.2.4. Specially crafted HTTP requests to Server Function endpoints cause excessive CPU usage for about a minute, ending in a catchable error.
- CVE-2026-23864High
Multiple denial of service vulnerabilities have been found in React Server Components packages (react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack). Specially crafted HTTP requests to Server Function endpoints can cause server crashes, out-of-memory exceptions, or excessive CPU usage.
Original NVD description (English source)
An information leak vulnerability exists in specific configurations of React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. A specifically crafted HTTP request sent to a vulnerable Server Function may unsafely return the source code of any Server Function. Exploitation requires the existence of a Server Function which explicitly or implicitly exposes a stringified argument.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS