# MLflow allows unauthorized access to multipart upload endpoints when the \`--serve-artifacts\` mode is enabled

Advisory record · `GHSA-8c7q-86fq-vvmh`

- **Identifiers:** `GHSA-8c7q-86fq-vvmh` · `BIT-mlflow-2026-2651` · `CVE-2026-2651` · `PYSEC-2026-2220`
- **State:** Confirmed
- **Severity:** CVSS 9.0 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-862](https://cwe.mitre.org/data/definitions/862.html) · [CWE-1220](https://cwe.mitre.org/data/definitions/1220.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md) · [CWE-1220](https://agentprime.io/advisories/tag/cwe-1220.md)
- **Published:** 26 May 2026
- **Updated:** 6 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 May 2026, 13:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.0: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `mlflow` (PyPI): affected `<3.10.0`; fixed in `3.10.0`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.0 Critical, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`, from CNA (@huntr_ai)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0034, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:08 UTC: First seen by agentprime
- 31 Oct 2026, 14:08 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-8c7q-86fq-vvmh)

## Sources

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

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-8c7q-86fq-vvmh>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-8c7q-86fq-vvmh/>. Everything for agents: <https://agentprime.io/llms.txt>.