CVE-2026-56121: Feast-Dev Feast

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

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.

Affected products

• Feast-Dev Feast: before 0.63.0 (fixed in 0.63.0)
• Red Hat Red Hat Openshift Ai 3.4: before 1787073866 (fixed in 1787073866); before 1787073873 (fixed in 1787073873); before 1787073459 (fixed in 1787073459); before 1787073611 (fixed in 1787073611); before 1787073451 (fixed in 1787073451); before 1787121387 (fixed in 1787121387); …
• Red Hat Red Hat Openshift Ai Rhoai

Published 2026-06-24. Last modified 2026-08-28.