---
cve: "CVE-2026-56121"
severity: "CRITICAL"
cvss: 9.3
epss: "1.4%"
vendor: "feast-dev"
kev: false
exploited: false
published: "2026-06-24 14:49:11"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T21:52:33+02:00"
---

# CVE-2026-56121

> 9.3 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 50ad181b420a8c95cdd421d3908d298fd355b1b5 (Commit)
- 835cda8e2c1359f1f496ad72701dbd6a73bdb25a (Commit)

## Referenzen

- <https://huntr.com/bounties/d64b8111-180b-46ba-afa3-c877fda2ede6>
- <https://github.com/feast-dev/feast/releases/tag/v0.63.0>
- <https://github.com/feast-dev/feast/commit/835cda8e2c1359f1f496ad72701dbd6a73bdb25a>
- <https://www.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserialization>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56121) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_