feast <0.63.0 unsafe deserialization RCE via grpc in user_defined_function.body
CVE-2026-56121 Published on June 24, 2026
Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization
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.
Vulnerability Analysis
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2026-56121 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2026-56121
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Affected Versions
feast-dev feast:- Before 0.63.0 is affected.