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Vulnerabilities

Vulnerability · CVE-2026-56121

Feast vulnerable to unsafe deserialization RCE in registry server via UDF proto

Published Jun 24, 2026 · catalog updated Nov 3, 2026 · Feast vulnerable to unsafe

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-56121. EPSS is 1.41%. Act only if a listed version of Feast vulnerable to unsafe is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Feast vulnerable to unsafe).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.41%
Remediation
Advisory link
Affected products
PyPI feast

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • PyPI feast0 → 0.63.0

How to fix CVE-2026-56121

  • Upgrade

    CVE-2026-56121 lists a fix boundary at 0.63.0. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 0.63.0

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-56121. EPSS is 1.41%. Act only if a listed version of Feast vulnerable to unsafe is installed.

Which versions are affected?

Compare what you have installed with 0 → 0.63.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS 1.41%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 24, 2026 · PyPA Advisory Database

    Detected

    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 e

  2. Nov 3, 2026 · PyPA Advisory Database

    Fix available

    feast fixed in 0.63.0

  3. Nov 3, 2026 · PyPA Advisory Database

    Fix available

    feast fixed in 0.63.0

  4. Nov 3, 2026 · PyPA Advisory Database

    Updated

    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 e

Sources

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • PyPA Advisory DatabaseNov 5, 2026
  • CVE.orgNov 4, 2026