CVE-2026-23538: high-severity vulnerability in Feast Feature Server
Feast: resource exhaustion via websocket endpoint
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.9%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Related CVEs — Feast Feature Server
In the same product, most dangerous first.
CVE-2026-23536HIGHFeast: unauthenticated arbitrary file readEPSS 2.4%CVE-2024-11831MEDIUMNpm-serialize-javascript: cross-site scripting (xss) in serialize-javascriptEPSS 1.1%CVE-2026-18948CRITICALFeast: feast: unsafe dill deserialization of registry-stored udfs — rce on feature server and registry serverEPSS 1.1%CVE-2026-23537CRITICALFeast: unauthenticated arbitrary file writeEPSS 1.0%CVE-2026-0603HIGHOrg.hibernate/hibernate-core: hibernate: information disclosure and data deletion via second-order sql injectionEPSS 1.0%CVE-2026-18941HIGHFeast: feast-operator: feast: default authentication mode is no_auth — shared multi-tenant instances deployed without authenticationEPSS 0.9%