CVE-2026-56121

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 v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/feast-dev/feast/commit/835cda8e2c1359f1f496ad72701dbd6a73bdb25a
https://github.com/feast-dev/feast/releases/tag/v0.63.0
https://huntr.com/bounties/d64b8111-180b-46ba-afa3-c877fda2ede6
https://www.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserialization
https://access.redhat.com/errata/RHSA-2026:60520
https://access.redhat.com/security/cve/CVE-2026-56121
https://bugzilla.redhat.com/show_bug.cgi?id=2492229
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56121.json

Configurations

No configuration.

History

No history.

Information

Published : 2026-06-24 16:16

Updated : 2026-08-28 16:18

NVD link : CVE-2026-56121

Mitre link : CVE-2026-56121

CVE.ORG link : CVE-2026-56121

JSON object : View

Products Affected

No product.

CWE

CWE-502

Deserialization of Untrusted Data

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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."}], "lastModified": "2026-08-28T16:18:15.057", "sourceIdentifier": "disclosure@vulncheck.com"}