{"cve":"CVE-2026-4137","nvd":{"published":"2026-05-18T21:16:40.710","modified":"2026-07-24T12:10:00.210","status":"Analyzed","description":"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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-378"],"references":["https://github.com/mlflow/mlflow/commit/1dcbb0c2fbd1f446c328830e601ca13a28219b8a","https://huntr.com/bounties/648dc30b-76c7-4433-86b8-f43d926fd8d6","https://huntr.com/bounties/648dc30b-76c7-4433-86b8-f43d926fd8d6"],"products":["lfprojects:mlflow"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-4137","score":0.00193,"percentile":0.09049,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-f2m9-wcf4-cwwx","url":"https://osv.dev/vulnerability/GHSA-f2m9-wcf4-cwwx","summary":"MLFlow Creates a Temporary File With Insecure Permissions ","modified":"2026-09-01T01:15:07.929492619Z","packages":[{"ecosystem":"PyPI","name":"mlflow","purl":"pkg:pypi/mlflow","ranges":[">=1.26.0 <3.11.0"],"fixed":["3.11.0"]}]},{"id":"PYSEC-2026-2655","url":"https://osv.dev/vulnerability/PYSEC-2026-2655","summary":"MLFlow Creates a Temporary File With Insecure Permissions ","modified":"2026-07-13T16:43:33.416174314Z","packages":[{"ecosystem":"PyPI","name":"mlflow","purl":"pkg:pypi/mlflow","ranges":["<3.11.0"],"fixed":["3.11.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}