CVE-2026-127202
MLflow < 3.18.0 Path Traversal via model_id in log_outputs API
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
MLflow before 3.18.0 using the FileStore backend contains a path traversal vulnerability that allows unauthenticated remote attackers to write files outside the intended run directory by supplying a malicious model_id parameter to the log outputs API. Attackers can exploit the unvalidated model_id containing ../ sequences via the POST /api/3.0/mlflow/runs/outputs endpoint to create directories and write a meta.yaml file at arbitrary filesystem locations, limited only by the server account's permissions. FileStore was the default backend before 3.7.0 and is opt-in afterward through MLFLOW_ALLOW_FILE_STORE.
| CWE | CWE-22 |
| Vendor | mlflow |
| Product | mlflow |
| Published | Nov 12, 2026 |
| Last Updated | Nov 13, 2026 |
Stay Ahead of the Next One
Get instant alerts for mlflow mlflow
Be the first to know when new medium vulnerabilities affecting mlflow mlflow are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
mlflow / mlflow
0 < 3.18.0
References
github.com: https://github.com/mlflow/mlflow/releases/tag/v3.18.0 github.com: https://github.com/mlflow/mlflow/pull/27131 github.com: https://github.com/mlflow/mlflow/commit/ab5fc795eedc22348253cf687818cf2a16c15282 vulncheck.com: https://www.vulncheck.com/advisories/mlflow-path-traversal-via-model-id-in-log-outputs-api
Credits
Florian Kabashi