MLflow vulnerable to arbitrary file read on unauthenticated servers via prompt model version source

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2026-116690: 1.80% estimated exploitation activity in the next 30 days; percentile 78.53 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary On MLflow tracking servers running without authentication, which is the default for mlflow server, a remote attacker can read arbitrary files from the server’s filesystem by creating a model version tagged as a prompt whose source is a schemeless local path. The fix for CVE-2026-2614 in 3.10.0 added a prompt-specific branch to the `CreateModelVersion` handler that rejects `file://` URIs and absolute paths but runs path validation only when the source carries a URL scheme. A schemeless value such as `../../etc`, a plain relative name, `.`, a percent-encoded path, or a Windows drive-letter path is therefore stored unchanged as the model version’s artifact location, and the `model-versions/get-artifact endpoint` later serves files from it with the privileges of the server process. The tag check also keyed on the presence of the `mlflow.prompt.is_prompt` tag rather than its value, so a false value still selected the weaker branch. Servers using `--app-name basic-auth` are…

Published by the source

27 Oct 2026, 21:26 UTC

Last modified by the source

27 Oct 2026, 21:45 UTC

Source last checked

28 Oct 2026, 06:05 UTC

1. Revision 2 · amended · 28 Oct 2026

   Amended from osv record GHSA-m65p-9j7q-6w33

2. Revision 1 · created · 27 Oct 2026

   Published from ghsa record GHSA-m65p-9j7q-6w33

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# Patch Next advisory brief: CVE-2026-116690

Advisory: MLflow vulnerable to arbitrary file read on unauthenticated servers via prompt model version source
IDs: CVE-2026-116690, GHSA-m65p-9j7q-6w33
Record: https://patchnext.com/advisories/cve-2026-116690 (revision 2, source checked 28 Oct 2026, 06:05 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: mlflow 3.17.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI mlflow: affected >= 3.10.0, < 3.17.0; fixed in 3.17.0

## Suggested inspection (read-only)
- `python -m pip show mlflow`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on mlflow.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-m65p-9j7q-6w33 (OSV record GHSA-m65p-9j7q-6w33 lists affected ranges: PyPI mlflow >=3.10.0 <3.17.0 (fixed))
- Verified: https://github.com/advisories/GHSA-m65p-9j7q-6w33 (GitHub-reviewed advisory GHSA-m65p-9j7q-6w33 lists affected ranges: PyPI mlflow >=3.10.0 <3.17.0)

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