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

Quick assessment

Affected
feast-dev feast
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

feast是Feast组织开源的一个 AI/ML 开源功能库。 Feast 0.63.0之前版本存在反序列化漏洞，该漏洞源于不安全的反序列化，可能导致未经身份验证或未授权的攻击者通过发送特制gRPC请求到注册表服务器实现远程代码执行。

CVSS 9.8 · Critical EPSS 1.41% · P72

Affected Version Matrix 1

VendorProduct Version RangeStatus
feast-dev feast < 0.63.0 affected
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I. Basic Information for CVE-2026-56121

Vulnerability Information
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Vulnerability Title
Feast < 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Feast 反序列化漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
feast是Feast组织开源的一个 AI/ML 开源功能库。 Feast 0.63.0之前版本存在反序列化漏洞，该漏洞源于不安全的反序列化，可能导致未经身份验证或未授权的攻击者通过发送特制gRPC请求到注册表服务器实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
feast-dev feast 0 ~ 0.63.0 -

II. Public POCs for CVE-2026-56121

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10209 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-56121

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Patches & Fixes for CVE-2026-56121 (1)

Vendor Advisories for CVE-2026-56121 (2)

Vendor Pages for CVE-2026-56121 (1)

IV. Related Vulnerabilities

Same product: feast
Same vendor: feast-dev
Same weakness: CWE-502