AI Threat Alert
CVE-2026-2651
CRITICALA 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...
Full CISO analysis pending enrichment.
What systems are affected?
| Package | Ecosystem | Vulnerable Range | Patched |
|---|---|---|---|
| MLflow | pip | — | No patch |
Do you use MLflow? You're affected.
How severe is it?
What is the attack surface?
What should I do?
No patch available
Monitor for updates. Consider compensating controls or temporary mitigations.
Which compliance frameworks are affected?
Compliance analysis pending. Sign in for full compliance mapping when available.
Frequently Asked Questions
What is CVE-2026-2651?
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.
Is CVE-2026-2651 actively exploited?
No confirmed active exploitation of CVE-2026-2651 has been reported, but organizations should still patch proactively.
How to fix CVE-2026-2651?
No patch is currently available. Monitor vendor advisories for updates.
What is the CVSS score for CVE-2026-2651?
CVE-2026-2651 has a CVSS v3.1 base score of 9.0 (CRITICAL).
What are the technical details?
Original Advisory
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.
Weaknesses (CWE)
CWE-862 — Missing Authorization: The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
- [Architecture and Design] Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
- [Architecture and Design] Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor [REF-7].
Source: MITRE CWE corpus.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H References
Timeline
Related Vulnerabilities
CVE-2025-15379 10.0 MLflow: RCE via unsanitized model dependency specs
Same package: mlflow CVE-2023-3765 10.0 MLflow: path traversal allows arbitrary file read
Same package: mlflow CVE-2023-2780 9.8 MLflow: path traversal allows arbitrary file read/write
Same package: mlflow CVE-2023-1177 9.8 MLflow: path traversal allows arbitrary file read/write
Same package: mlflow CVE-2026-2635 9.8 mlflow: security flaw enables exploitation
Same package: mlflow