CVE-2026-23538
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Resource Exhaustion via Unauthenticated WebSocket Connections in Feast Feature Server

Publication date: 2026-07-16

Last updated on: 2026-07-16

Assigner: Red Hat, Inc.

Description
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.

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Meta Information

Published
2026-07-16
Last Modified
2026-07-16
Generated
2026-08-05
AI Q&A
2026-07-16
EPSS Evaluated
2026-08-04
NVD
CVE-2026-23538
EUVD
EUVD-2026-44838

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
red_hat_data_services feast to 0.58.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

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Executive Summary

This vulnerability allows remote attackers to create persistent WebSocket connections to the Feast Feature Server's /ws/chat endpoint without authentication. By opening many simultaneous connections, attackers can exhaust server resources like memory, CPU, and file descriptors, causing a denial of service for legitimate users.

Detection Guidance

Monitor for unusually high numbers of WebSocket connections to the Feast Feature Server's /ws/chat endpoint. Use network tools like netstat or ss to check for persistent connections from unknown sources. Inspect server logs for repeated connection attempts to this endpoint without prior authentication.

Impact Analysis

If exploited, this vulnerability could make the Feast Feature Server unresponsive or crash, preventing legitimate users from accessing its services. It may also lead to information disclosure if the server becomes unstable under resource exhaustion.

Compliance Impact

This vulnerability could lead to resource exhaustion, causing system downtime or degraded performance. Such disruptions may violate compliance requirements under GDPR (availability of data) or HIPAA (access to protected health information) if critical services become unavailable.

Mitigation Strategies

Upgrade Feast Feature Server to a version higher than 0.58.0. Implement network-level restrictions to block unauthenticated WebSocket connections to /ws/chat. Temporarily disable the /ws/chat endpoint if an upgrade is not immediately possible.

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