AI agent vulnerability · MLflow

CVE-2026-2651: MLflow allows unauthorized access to multipart upload endpoints when the `--serve-artifacts` mode is enabled

criticalCVSS 3.0 9.0GHSA-8c7q-86fq-vvmh

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.

Published May 26, 2026 · Updated Oct 6, 2026

Affected packages

mlflow

Ecosystem: PyPI
Affected: < 3.10.0
Fixed in: 3.10.0
Check: pip show mlflow

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

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.

Credited to klaudialax.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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