EUVD-2026-44838
GHSA-gmv6-fcfc-3372
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable /ws/chat with no auth or interaction and low complexity gives AV:N/AC:L/PR:N/UI:N; resource exhaustion is availability-only, so C:N/I:N/A:H.
Primary rating from Vendor (redhat).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Denial of service in the Feast Feature Server (the Python feature-store serving component, also shipped within Red Hat OpenShift AI/RHOAI) lets remote unauthenticated attackers exhaust host resources through its /ws/chat WebSocket endpoint. Because the endpoint accepts unlimited concurrent connections and unbounded message traffic, opening many simultaneous sockets drains memory, CPU, and file descriptors until legitimate clients are locked out. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The exploit requires only network reachability to the Feature Server's `/ws/chat` WebSocket endpoint, which per the CVSS vector (PR:N/UI:N) accepts unauthenticated connections against affected default builds and requires no user interaction. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, base 7.5) is internally consistent with the description: network-reachable, low-complexity, no privileges, no user interaction, and availability-only impact with zero confidentiality or integrity loss. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach the Feature Server's HTTP port opens thousands of persistent connections to `/ws/chat`, none of which require credentials, and holds them open while streaming traffic. Server memory, CPU, and file descriptors are consumed until the process can no longer accept connections from legitimate ML applications, producing a sustained outage. … |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed - apply the change from https://github.com/red-hat-data-services/feast/pull/192, which enforces a maximum of 5 concurrent WebSocket connections, a 4096-byte message-size cap, a 60-messages-per-minute rate limit, and a 60-second read timeout, and additionally requires authentication (inject_user_details) on `/read-document` and `/save-document`. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Feast Feature Server instances and Red Hat OpenShift AI deployments; identify which are Internet-facing or accessible from untrusted networks; monitor system resource utilization (memory, CPU, file descriptors) for anomalies. …
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More in Feast Feature Server
View allSame technique Denial Of Service
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