{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.63.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "50ad181b420a8c95cdd421d3908d298fd355b1b5"
            },
            {
              "fixed": "835cda8e2c1359f1f496ad72701dbd6a73bdb25a"
            }
          ],
          "repo": "https://github.com/feast-dev/feast",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-502"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56121.json"
  },
  "details": "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.",
  "id": "CVE-2026-56121",
  "modified": "2026-07-16T03:31:01.055304187Z",
  "published": "2026-06-24T14:49:11.490Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56121.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-56121"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56121.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/feast-dev/feast/releases/tag/v0.63.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56121"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/feast-unauthenticated-rce-via-applyfeatureview-grpc-deserialization"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492229"
    },
    {
      "type": "FIX",
      "url": "https://github.com/feast-dev/feast/commit/835cda8e2c1359f1f496ad72701dbd6a73bdb25a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/feast-dev/feast"
    },
    {
      "type": "EVIDENCE",
      "url": "https://huntr.com/bounties/d64b8111-180b-46ba-afa3-c877fda2ede6"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Feast \u003c 0.63.0 Unauthenticated RCE via ApplyFeatureView gRPC Deserialization"
}