CVE-2026-23538
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk50th percentile - higher than 50% of all known CVEs
Summary
A vulnerability in the `/ws/chat` endpoint of the Feast Feature Server allows remote attackers to establish persistent WebSocket connections without authentication. Opening a large number of simultaneous connections can exhaust server resources such as memory, CPU, and file descriptors, leading to a complete denial of service for legitimate users.
Risk Assessment
The risk is the potential for a DoS attack that can render the Feast Feature Server unavailable, blocking access for legitimate users and potentially disrupting dependent applications.
Recommendation
Immediately implement authentication for the `/ws/chat` endpoint and limit the number of concurrent WebSocket connections per client. It is also recommended to deploy monitoring and rate-limiting mechanisms for connections.
Other vulnerabilities in Feast Feature Server
See all- CVE-2026-23537Critical
A vulnerability in the Feast Feature Server's `/save-document` endpoint allows an unauthenticated remote attacker to write arbitrary JSON files to the server's filesystem. Despite location restrictions, these can be bypassed, enabling overwriting of critical application configurations or startup scripts.
- CVE-2026-23536High
A security issue was discovered in the Feast Feature Server's `/read-document` endpoint that allows an unauthenticated remote attacker to read any file accessible to the server process. By sending a specially crafted HTTP POST request, an attacker can bypass intended access restrictions to potentially retrieve sensitive system files, application configurations, and credentials.
Original NVD description (English source)
A vulnerability was identified in the Feast Feature Server's `/ws/chat` endpoint that allows remote attackers to establish persistent WebSocket connections without any authentication. By opening a large number of simultaneous connections, an attacker can exhaust server resources—such as memory, CPU, and file descriptors—leading to a complete denial of service for legitimate users.