CVE-2026-4137: high-severity vulnerability in mlflow/mlflow
Incomplete Fix for CVE-2025-10279: Insecure Temporary Directory Permissions in mlflow/mlflow
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7epss 0.2%
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.
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
mlflow · mlflow/mlflowRelated CVEs — mlflow/mlflow
In the same product, most dangerous first.
CVE-2023-6909HIGHPath Traversal: '\..\filename' in mlflow/mlflowEPSS 89.7%CVE-2023-1177CRITICALPath Traversal: '\..\filename' in mlflow/mlflowEPSS 69.7%CVE-2023-3765CRITICALAbsolute Path Traversal in mlflow/mlflowEPSS 67.3%CVE-2023-6018CRITICALMLflow Arbitrary File WriteEPSS 47.9%CVE-2024-3848HIGHPath Traversal Bypass in mlflow/mlflowEPSS 43.0%CVE-2024-2928HIGHLocal File Inclusion (LFI) via URI Fragment Parsing in mlflow/mlflowEPSS 21.8%