CVE-2026-56121criticalCWE-502

CVE-2026-56121: critical vulnerability in feast-dev feast

Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization

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48Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 9.3epss 1.4%
from disclosure to weapon6 days
Published on NVDJun 24
1st PoC+6d
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
feast-dev · feast
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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