CVE-2026-56121
CriticalCVSS 9.8Exploitation Probability (EPSS)
Elevated risk54th percentile — higher than 54% of all known CVEs
Summary
Feast before version 0.63.0 contains an unsafe deserialization vulnerability that allows unauthenticated or unauthorized attackers to achieve remote code execution by sending a crafted gRPC request to the registry server. The user_defined_function.body field of an OnDemandFeatureView spec is decoded from base64 and passed to dill.loads() before any authorization check is performed, enabling attackers to embed a malicious serialized Python object with an arbitrary __reduce__ method to execute OS commands as the feast service account.
Risk Assessment
The risk for the organization includes full compromise of the Feast registry server by an attacker, which can lead to data theft, model modification, or further attacks on infrastructure, especially if the Feast service account has broad privileges.
Recommendation
Immediately upgrade Feast to version 0.63.0 or later, which includes a fix for this vulnerability. Until the update is applied, restrict access to the registry server to trusted networks and users only.
Original NVD description (English source)
Feast before 0.63.0 contains an unsafe deserialization vulnerability that allows unauthenticated or unauthorized attackers to achieve remote code execution by sending a crafted gRPC request to the registry server. The user_defined_function.body field of an OnDemandFeatureView spec is decoded from base64 and passed to dill.loads() before any authorization check is performed, enabling attackers to embed a malicious serialized Python object with an arbitrary __reduce__ method to execute OS commands as the feast service account.