mlflow Creates of Temporary File in Directory with Insecure Permissions

Exploitation

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

CVSS

7.0 · CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2025-10279: 0.24% estimated exploitation activity in the next 30 days; percentile 15.27 (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.

In mlflow version 2.20.3, the temporary directory used for creating Python virtual environments is assigned insecure world-writable permissions (0o777). This vulnerability allows an attacker with write access to the /tmp directory to exploit a race condition and overwrite .py files in the virtual environment, leading to arbitrary code execution. The issue is resolved in version 3.4.0.

Published by the source

2 Feb 2026, 12:31 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 13:36 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-4x5p-f36r-mxxr

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-4x5p-f36r-mxxr

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-10279

Advisory: mlflow Creates of Temporary File in Directory with Insecure Permissions
IDs: CVE-2025-10279, GHSA-4x5p-f36r-mxxr
Record: https://patchnext.com/advisories/cve-2025-10279 (revision 2, source checked 26 Oct 2026, 13:36 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: mlflow 3.4.0rc0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI mlflow: affected < 3.4.0rc0; fixed in 3.4.0rc0

## 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-4x5p-f36r-mxxr (OSV record GHSA-4x5p-f36r-mxxr lists affected ranges: PyPI mlflow >=0 <3.4.0rc0 (fixed))
- Verified: https://github.com/advisories/GHSA-4x5p-f36r-mxxr (GitHub-reviewed advisory GHSA-4x5p-f36r-mxxr lists affected ranges: PyPI mlflow >=0 <3.4.0rc0)

Commands are suggestions: review each one before running it.