---
id: CVE-2026-2651
aliases:
  - GHSA-8c7q-86fq-vvmh
  - BIT-mlflow-2026-2651
  - PYSEC-2026-2220
title: >-
  MLflow allows unauthorized access to multipart upload endpoints when the
  `--serve-artifacts` mode is enabled
summary: >-
  MLflow allows unauthorized access to multipart upload endpoints when the
  `--serve-artifacts` mode is enabled
severity: critical
cvss: 9
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H'
vendor: mlflow
product: mlflow
ecosystem: pip
affected:
  - mlflow < 3.11.0rc1
patched:
  - mlflow 3.11.0rc1
published: '2026-05-26'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-8c7q-86fq-vvmh'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-2651'
  - url: >-
      https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f
  - url: 'https://access.redhat.com/security/cve/CVE-2026-2651'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2481117'
  - url: 'https://github.com/mlflow/mlflow'
  - url: 'https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2651.json
tags:
  - osv
  - pip
epss: 0.00536
epssPercentile: 0.42812
ingestedAt: '2026-07-13T18:57:54.972Z'
---

## Overview

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 packages

- `mlflow < 3.11.0rc1`

## Remediation

Upgrade to a patched release:

- `mlflow 3.11.0rc1`