# mlflow Creates of Temporary File in Directory with Insecure Permissions

Advisory record · `GHSA-4x5p-f36r-mxxr`

- **Identifiers:** `GHSA-4x5p-f36r-mxxr` · `BIT-mlflow-2025-10279` · `CVE-2025-10279` · `PYSEC-2026-1639`
- **State:** Confirmed
- **Severity:** CVSS 7.0 High
- **Critical:** No
- **Weakness (CWE):** [CWE-379](https://cwe.mitre.org/data/definitions/379.html)
- **Tags:** [CWE-379](https://agentprime.io/advisories/tag/cwe-379.md)
- **Published:** 2 Feb 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 2 Feb 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `mlflow` (PyPI): affected `<3.4.0rc0`; fixed in `3.4.0rc0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> mlflow versions before 3.4.0rc0 create temporary directories used for Python virtual environments with world-writable permissions (0o777). An attacker who can write to the /tmp directory on the same system could exploit a race condition to overwrite .py files in the virtual environment and run arbitrary code. Upgrade mlflow to 3.4.0rc0 or later.

Written 5 Nov 2026.

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0024, the 15th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:34 UTC: First seen by agentprime
- 31 Oct 2026, 14:34 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-4x5p-f36r-mxxr)

## Sources

- [GitHub Advisory Database: GHSA-4x5p-f36r-mxxr](https://github.com/advisories/GHSA-4x5p-f36r-mxxr)
- [OSV: GHSA-4x5p-f36r-mxxr](https://osv.dev/vulnerability/GHSA-4x5p-f36r-mxxr)
- <https://nvd.nist.gov/vuln/detail/CVE-2025-10279>
- <https://github.com/mlflow/mlflow/commit/1d7c8d4cf0a67d407499a8a4ffac387ea4f8194a>
- <https://github.com/mlflow/mlflow>
- <https://huntr.com/bounties/01d3b81e-13d1-43aa-b91a-443aec68bdc8>

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-4x5p-f36r-mxxr>, 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-4x5p-f36r-mxxr/>. Everything for agents: <https://agentprime.io/llms.txt>.