CVE-2026-18948
CriticalCVSS 9.9Summary
A flaw was found in Feast where the system improperly deserializes user-defined functions (UDFs) stored in its registry, 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.
Risk Assessment
Risk of remote code execution, potentially leading to cross-tenant data access and lateral movement within the system.
Recommendation
Update Feast to the latest patched version. Restrict access to the registry and feature server, and monitor for unusual activity.
Original NVD description (English source)
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.