CVE-2026-56121
Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization
- State
- Published
- Severity
- 9.3 Critical
- Published
- Jun 24, 2026
- Updated
- Aug 28, 2026
- Reserved
- Jun 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
- CWE-502 Deserialization of Untrusted Data
Affected Products
| Product | Versions |
|---|---|
feastfeast-dev |
|
References
- Huntr Disclosuretechnical-descriptionexploit
- Release Notesrelease-notes
- Patch Commitpatch
- https://www.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserializationthird-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-56121vdb-entry
- RHBZ#2492229issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56121.json
- https://access.redhat.com/errata/RHSA-2026:60520vendor-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.