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CVE

CVE-2026-56121

Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization
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CVE

CVE-2026-56121

Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization

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 userdefinedfunction.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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56121.json, https://access.redhat.com/security/cve/CVE-2026-56121, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56121.json, https://github.com/feast-dev/feast/releases/tag/v0.63.0, https://nvd.nist.gov/vuln/detail/CVE-2026-56121, https://www.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserialization, https://bugzilla.redhat.com/show_bug.cgi?id=2492229, https://github.com/feast-dev/feast/commit/835cda8e2c1359f1f496ad72701dbd6a73bdb25a, https://github.com/feast-dev/feast, https://huntr.com/bounties/d64b8111-180b-46ba-afa3-c877fda2ede6

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.01143%
EPSS Percentile
0.64238%
Introduced Version
0
Fix Available
835cda8e2c1359f1f496ad72701dbd6a73bdb25a

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