CVE-2026-56121
Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-502 |
| Vendor | feast-dev |
| Product | feast |
| Published | Jun 24, 2026 |
| Last Updated | Jun 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
feast-dev / feast
0 < 0.63.0
References
huntr.com: https://huntr.com/bounties/d64b8111-180b-46ba-afa3-c877fda2ede6 github.com: https://github.com/feast-dev/feast/releases/tag/v0.63.0 github.com: https://github.com/feast-dev/feast/commit/835cda8e2c1359f1f496ad72701dbd6a73bdb25a vulncheck.com: https://www.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserialization
Credits
Tanguy Snoeck