CVE-2026-561219.8CriticalCWE-502

CVE-2026-56121: Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization

feast-dev · feast

Fixed in 0.63.0 · Affected: feast-dev before 0.63.0 · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.4%probability of exploitation in the next 30 days

73rd percentile

050100

Higher than 73% of scored CVEs

9.8CriticalCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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 products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

feast-dev · feastbefore 0.63.0

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Deserialization of Untrusted Data · Deserialization and Object Injection
Vendor: feast-dev
Published: June 2026
Band: Possible (1 to 10%), June 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-56121 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.