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

Severity: critical (CVSS 9.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-10 · updated 2026-09-28
Weakness: CWE-502

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.

Affected products

Red Hat OpenShift AI 2.25: all versions — fixed in 1786110051
Red Hat OpenShift AI 3.3: all versions — fixed in 1786110033
Red Hat OpenShift AI 3.4: all versions — fixed in 1786107278, 1787068065

How to fix

Upgrade to a fixed version: Red Hat OpenShift AI 2.25 1786110051; Red Hat OpenShift AI 3.3 1786110033; Red Hat OpenShift AI 3.4 1786107278, 1787068065. Check the vendor advisory for mitigations.

References

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