CVE-2026-23864
HighCVSS 7.5Exploitation Probability (EPSS)
High risk83th percentile - higher than 83% of all known CVEs
Summary
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.
Risk Assessment
The risk involves potential disruption of application availability through remote server overload, leading to service outages and financial losses.
Recommendation
Immediately upgrade all affected packages (react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack) to the latest versions to mitigate the vulnerabilities.
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-2025-55183Medium
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.
- 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.
Original NVD description (English source)
Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack. The vulnerabilities are triggered by sending specially crafted HTTP requests to Server Function endpoints, and could lead to server crashes, out-of-memory exceptions or excessive CPU usage; depending on the vulnerable code path being exercised, the application configuration and application code. Strongly consider upgrading to the latest package versions to reduce risk and prevent availability issues in applications using React Server Components.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS