---
title: "CVE-2026-2651: MLflow allows unauthorized access to multipart upload endpoints when the `--serve-artifacts` mode is enabled"
url: https://erroneo.us/security/cve/CVE-2026-2651/
description: "CVE-2026-2651 (mlflow (PyPI)): A vulnerability in MLflow versions Fixes, deadlines and original sources."
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-25
date_modified: 2026-10-06
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-2651"
kev: false
cvss: 9
epss: 0.00536
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.5% , percentile 44: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 44% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes mlflow (PyPI) < 3.10.0, fixed in 3.10.0 . Check your lockfile, including transitive dependencies.

## What it is

A vulnerability in MLflow versions

## Affected packages

- PyPI `mlflow` < 3.10.0 → fixed: 3.10.0

## Affected products (CVE record)

- mlflow mlflow/mlflow: unspecified < 3.10.0

## Severity

- @huntr_ai CVSS 3.0: 9 `CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`
- redhat-SADP CVSS 3.1: 9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.0 `CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.54% probability of exploitation activity in the next 30 days; percentile 44.

## Sources

- [GitHub Advisory GHSA-8c7q-86fq-vvmh](https://github.com/advisories/GHSA-8c7q-86fq-vvmh)
- [CVE.org record CVE-2026-2651](https://www.cve.org/CVERecord?id=CVE-2026-2651)
- [NVD entry CVE-2026-2651](https://nvd.nist.gov/vuln/detail/CVE-2026-2651)
- [huntr.com](https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc)
- [github.com](https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f)
- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-2651)
- [RHBZ#2481117](https://bugzilla.redhat.com/show_bug.cgi?id=2481117)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2651.json)
- [github.com](https://github.com/pypa/advisory-database/tree/main/vulns/mlflow/PYSEC-2026-2220.yaml)

---
Source page: https://erroneo.us/security/cve/CVE-2026-2651/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt