CVE-2026-56121
Critical · CVSS 9.8Feast (feast-dev/feast) — Unsafe deserialization RCE via dill.loads() in gRPC registry server
- CVSS
- 9.8
- nvd
- EPSS
- —
- KEV
- No
- Class
- oss containerizable
- CWE-502, CWE-502
Description
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.
Search profile — drives PoC discovery
Ranked PoCs (1) — best first
Heuristic ranking — not yet expert-vetted. Scored on structure + provenance, not execution.
- ★ 0
Recall-favoring discovery; ranking by the Stage-4 scorer (Adam's rubric). Scanner/aggregator repos are hidden.
References
- 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/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
Status: enriched · ingested 2026-07-15T00:00:20.000Z · profiled 2026-07-15T00:30:20.000Z