Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N L N N N H H H 9.3 .0141 71.7 —
AFFECTED Product Versions Fixed feast unspecified —
TIMELINE Jun 18 Reserved by VulnCheck Jun 24 Published (CNA: VulnCheck) Aug 27 EXPLOIT PUBLISHED — CVE-2026-56121 (feast-dev feast). Public exploit reference added.
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.
| Date | Event | Detail |
|---|---|---|
| June 18, 2026 | Reserved | Reserved by VulnCheck |
| June 24, 2026 | Published | Published (CNA: VulnCheck) |
| August 27, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-56121 (feast-dev feast). Public exploit reference added. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| feast-dev | feast | — | — | — |
Authoritative record: CVE-2026-56121 at cve.org
Vendors: feast-dev
Weaknesses: CWE-502
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-56121 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
