MLflow allows unauthorized access to multipart upload endpoints when the `--serve-artifacts` mode is enabled
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-2651US | —OT elevated | — | ||
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 logi… | ||||
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/CVE-2026-2651WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2481117WEB
- https://github.com/advisories/GHSA-8c7q-86fq-vvmhADVISORY
- https://github.com/mlflow/mlflowPACKAGE
- https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966fWEB
- https://github.com/pypa/advisory-database/tree/main/vulns/mlflow/PYSEC-2026-2220.yamlWEB
- https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dcWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-2651ADVISORY
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