CVE-2026-2651

Description

A vulnerability in MLflow versions <=3.10.1.dev0 allows unauthorized access to multipart upload (MPU) endpoints when the `--serve-artifacts` mode is enabled. The authorization logic does not enforce resource-level permission checks for `/mlflow-artifacts/mpu/*` endpoints, enabling attackers to overwrite artifacts belonging to other users. This can lead to unauthorized cross-user writes, model supply chain poisoning, and arbitrary code execution when compromised models are loaded. The issue is resolved in version 3.10.0.

CVSS Metrics

• v3.0•CRITICAL•Score: 9CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Techniques & Countermeasures

• CWE-862•Missing Authorization

  The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Affected Systems

• mlflow•mlflow/mlflow

  ≥ unspecified, < 3.10.0

References (2)

• https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc
• https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f