TI-2026-03586 Aliases CVE-2026-4137 GHSA-f2m9-wcf4-cwwx

Incomplete Fix for CVE-2025-10279: Insecure Temporary Directory Permissions in mlflow/mlflow

HIGH 69CWE-378Published 2026-05-18 · Updated 2026-05-19

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

In mlflow/mlflow versions prior to 3.11.0, the `get_or_create_nfs_tmp_dir()` function in `mlflow/utils/file_utils.py` creates temporary directories with world-writable permissions (0o777), and the `_create_model_downloading_tmp_dir()` function in `mlflow/pyfunc/__init__.py` creates directories with group-writable permissions (0o770). These insecure permissions allow local attackers to tamper with model artifacts, such as cloudpickle-serialized Python objects, and achieve arbitrary code execution when the tampered artifacts are deserialized via `cloudpickle.load()`. This vulnerability is particularly critical in environments with shared NFS mounts, such as Databricks, where NFS is enabled by default. The issue is a continuation of the vulnerability class addressed in CVE-2025-10279, which was only partially fixed.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00193 9th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed mlflow/mlflow (mlflow): 3.11.0mlflow (PyPI): 3.11.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
MLflow	mlflow/mlflow	before 3.11.0	3.11.0	Patch available	CNA
—	mlflow (PyPI)	1.26.0 to before 3.11.0	3.11.0	Patch available	GHSA-f2m9-wcf4-cwwx

mlflow/mlflow VendorMLflow Affected before 3.11.0 Fixed in 3.11.0 Patch available CNA
mlflow (PyPI) Vendor— Affected 1.26.0 to before 3.11.0 Fixed in 3.11.0 Patch available GHSA-f2m9-wcf4-cwwx

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:lfprojects:mlflow::::::::	before 3.11.0	Vulnerable	MLflow

cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:* Versions before 3.11.0 Vulnerable ·MLflow

Remediation

Fix · CNA mlflow/mlflow (mlflow) Fixed in 3.11.0
Fix · GHSA-f2m9-wcf4-cwwx mlflow (PyPI) Fixed in 3.11.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 1 product

Red Hat OpenShift AI (RHOAI)

Timeline

2026-10-02 Threatist record created from CVE-2026-4137
2026-10-03 Alias added: GHSA-f2m9-wcf4-cwwx

References

Exploit 1

https://huntr.com/bounties/648dc30b-76c7-4433-86b8-f43d926fd8d6

Patch 1

https://github.com/mlflow/mlflow/commit/1dcbb0c2fbd1f446c328830e601ca13a28219b8a

Advisory 2

Other 3

TI-2026-46366 Server-side request forgery in mlflow KEVCVSS 3.1CRITICAL 9.3
TI-2023-03518 Absolute Path Traversal in mlflow/mlflow CVSS 3.1CRITICAL 10.0
TI-2023-01113 Path Traversal: '\..\filename' in mlflow/mlflow CVSS 3.1CRITICAL 9.8
TI-2025-14028 Command Injection in mlflow/mlflow CVSS 3.1CRITICAL 10.0
TI-2023-05540 MLflow Authentication Bypass CVSS 3.1CRITICAL 9.8
TI-2023-02603 Path Traversal: '\..\filename' in mlflow/mlflow CVSS 3.1CRITICAL 9.8

See all 76 →

Sources

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