CVE-2026-2651
Critical · CVSS 9.0MLflow — Missing Authorization / Improper Authorization on Multipart Upload Endpoints (CWE-862, CWE-1220)
- CVSS
- 9.0
- nvd
- EPSS
- —
- KEV
- No
- Class
- oss containerizable
- CWE-862, CWE-1220
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.
Search profile — drives PoC discovery
Symbols /mlflow-artifacts/mpu/*--serve-artifactsmultipart uploadMPUmlflow-artifactsserve_artifactsmpu_endpointsauthorizationresource-level permission
Keywords CVE-2026-2651MLflow multipart upload unauthorized accessMLflow MPU endpoint missing authorizationMLflow serve-artifacts bypassMLflow artifact overwriteMLflow model supply chain poisoningMLflow mpu PoCMLflow CWE-862MLflow unauthorized cross-user writeMLflow 3.10.0 patch
Versions: <=3.10.1.dev0
Affected packages
| Bitnami | mlflow | 0 → 3.11.1 |
| PyPI | mlflow | 0 → 3.11.0rc0 |
| PyPI | mlflow | 0 → 3.11.0rc1 |
References
- https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f
- https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc
- https://access.redhat.com/security/cve/CVE-2026-2651
- https://bugzilla.redhat.com/show_bug.cgi?id=2481117
- https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2651.json
Status: enriched · ingested 2026-06-27T06:00:38.000Z · profiled 2026-07-01T00:30:14.000Z