What’s Vulnerable › Vulnerabilities

CVE-2026-23538: Feast: resource exhaustion via websocket endpoint

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-16 · updated 2026-07-16
• Weakness: CWE-770

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.

Affected products

• Feast Feature Server: before 0.59.0 — fixed in 0.59.0

How to fix

Upgrade to a fixed version: Feast Feature Server 0.59.0. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2026-23538
• https://bugzilla.redhat.com/show_bug.cgi?id=2429311
• https://github.com/red-hat-data-services/feast/pull/192
• https://access.redhat.com/security/cve/CVE-2026-23538
• https://bugzilla.redhat.com/show_bug.cgi?id=2429311
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23538.json

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