{"id":"BIT-mlflow-2026-4137","summary":"Incomplete Fix for CVE-2025-10279: Insecure Temporary Directory Permissions in mlflow/mlflow","details":"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.","aliases":["CVE-2026-4137","GHSA-f2m9-wcf4-cwwx","PYSEC-2026-2655"],"modified":"2026-09-08T08:47:42.876614078Z","published":"2026-06-05T05:49:11.238Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*"]},"references":[{"type":"FIX","url":"https://github.com/mlflow/mlflow/commit/1dcbb0c2fbd1f446c328830e601ca13a28219b8a"},{"type":"ADVISORY","url":"https://huntr.com/bounties/648dc30b-76c7-4433-86b8-f43d926fd8d6"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4137"}],"affected":[{"package":{"name":"mlflow","ecosystem":"Bitnami","purl":"pkg:bitnami/mlflow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.11.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mlflow/BIT-mlflow-2026-4137.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}],"schema_version":"1.9.0"}