MLflowGHSA-8c7q-86fq-vvmh
MLflow allows unauthorized access to multipart upload endpoints when the `--serve-artifacts` mode is enabled
Critical9.0CVE-2026-2651 · Published May 26, 2026 · updated Jul 14, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| mlflow PyPI | < 3.11.0rc1 | 3.11.0rc1 |
Details and references
- CVSS 3.0
- CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-1220, CWE-862
- Also known as
- BIT-mlflow-2026-2651, CVE-2026-2651, PYSEC-2026-2220
- nvd.nist.gov/vuln/detail/CVE-2026-2651
- github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f
- access.redhat.com/security/cve/CVE-2026-2651
- bugzilla.redhat.com/show_bug.cgi?id=2481117
- github.com/mlflow/mlflow
- huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2651.json
More MLflow advisories
All MLflow| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jun 4 | MLflow: Deterministic sampling in dataset digest enables predictable collisions Low3.6Jun 4 | Low3.6 | 3.10.1 |
| Jun 3 | MLflow: Environment variable injection in AI Gateway secrets enables server-side credential exfiltrationCritical9.1Jun 3 | Critical9.1 | 3.11.0 |
| Jun 2 | MLflow: Any authenticated user can enumerate all gateway secrets, endpoints, and model definitionsMedium6.5Jun 2 | Medium6.5 | 3.11.0rc0 |
| May 21 | MLflow: information disclosureMedium6.5May 21 | Medium6.5 | 3.10.0 |
| May 19 | MLflow: origin validation errorCritical9.6May 19 | Critical9.6 | 3.10.0 |
| May 18 | MLFlow Creates a Temporary File With Insecure PermissionsHigh7.0May 18 | High7.0 | 3.11.0 |