CVE-2026-2651
Missing Authorization Validation in mlflow/mlflow
- State
- Published
- Severity
- 9.0 Critical
- Published
- May 25, 2026
- Updated
- Jul 15, 2026
- Reserved
- Feb 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.0 | 9.0 Critical | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H | @huntr_ai |
| 3.1 | 9.0 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
mlflow/mlflowmlflow |
|
References
- https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc
- https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f
- https://access.redhat.com/security/cve/CVE-2026-2651vdb-entry
- RHBZ#2481117issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2651.json
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