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CVE-2026-56121

9.8 · CRITICAL

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…

Published Jun 24, 2026CWE-502EPSS 1.41%

Overview

CVE-2026-56121 is a critical-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/feast-dev/feast/commit/835cda8e2c1359f1f496ad72701dbd6a73bdb25aGitHubgithub.com/feast-dev/feast/releases/tag/v0.63.0Refhuntr.com/bounties/d64b8111-180b-46ba-afa3-c877fda2ede6Refwww.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserializationRefaccess.redhat.com/errata/RHSA-2026:60520Refaccess.redhat.com/security/cve/CVE-2026-56121Refbugzilla.redhat.com/show_bug.cgi?id=2492229Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56121.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-56121?

CVE-2026-56121 is a critical-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-56121?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-56121?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-56121?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-56121 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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