CVE-2026-56121Public exploitNetwork attack vector

Unauthenticated code execution via pre-authorization UDF deserialization

Published Jun 24, 2026 · Updated Jun 24, 2026

Unsafe deserialization in Feast before 0.63.0 allows remote attackers to execute OS commands through a crafted registry gRPC request. ApplyFeatureView passes an incoming OnDemandFeatureView UDF body to dill.loads() before assert_permissions_to_update evaluates access. Network access to the registry service is sufficient, and commands run with the Feast service account's privileges.

CVSS severity9.3
Critical
EPSS probability1.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Feast before 0.63.0 allows remote attackers to execute OS commands through a crafted registry gRPC request. ApplyFeatureView passes an incoming OnDemandFeatureView UDF body to dill.loads() before assert_permissions_to_update evaluates access. Network access to the registry service is sufficient, and commands run with the Feast service account's privileges.

The record

CVE
CVE-2026-56121
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
Feast
Product
Feast
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.63.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Feast · Feastversion=0 <0.63.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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