MLFlow Creates a Temporary File With Insecure Permissions
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.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | mlflow | >= 1.26.0, < 3.11.0 | 3.11.0 |
Referencias
- https://nvd.nist.gov/vuln/detail/CVE-2026-4137
- https://github.com/mlflow/mlflow/commit/1dcbb0c2fbd1f446c328830e601ca13a28219b8a
- https://github.com/advisories/GHSA-4x5p-f36r-mxxr
- https://github.com/mlflow/mlflow
- https://huntr.com/bounties/648dc30b-76c7-4433-86b8-f43d926fd8d6
- https://pypi.org/project/mlflow
- https://github.com/advisories/GHSA-f2m9-wcf4-cwwx
- https://github.com/mlflow/mlflow/commit/bd8854fb2b4b168a4384ebddc6c4a0b5d56aff01
- https://github.com/pypa/advisory-database/tree/main/vulns/mlflow/PYSEC-2026-2655.yaml
- Vector CVSS
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-378- Plataforma
- Python (PyPI)
- Paquete
mlflow- Publicada
- 18.05.2026
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-2655 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-f2m9-wcf4-cwwx - CC BY 4.0
Historial de vulnerabilidades: mlflow
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 82
- Primera → última
- 02.2022 09.2026
- Sin corrección
- 18
- Explotada en ataques
- 1
Distribución por gravedad
- Crítica 20
- Alta 48
- Media 13
- Baja 1
Divulgaciones por año
- 2022: 1
- 2023: 22
- 2024: 24
- 2025: 8
- 2026: 27
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MLFlow Creates a Temporary File With Insecure Permissions esta entrada
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