{"id":"CVE-2026-127202","summary":"MLflow \u003c 3.18.0 Path Traversal via model_id in log_outputs API","details":"MLflow before 3.18.0 using the FileStore backend contains a path traversal vulnerability that allows unauthenticated remote attackers to write files outside the intended run directory by supplying a malicious model_id parameter to the log outputs API. Attackers can exploit the unvalidated model_id containing ../ sequences via the POST /api/3.0/mlflow/runs/outputs endpoint to create directories and write a meta.yaml file at arbitrary filesystem locations, limited only by the server account's permissions. FileStore was the default backend before 3.7.0 and is opt-in afterward through MLFLOW_ALLOW_FILE_STORE.","modified":"2026-11-14T02:47:32.459682505Z","published":"2026-11-12T16:37:02.081Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/127xxx/CVE-2026-127202.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/127xxx/CVE-2026-127202.json"},{"type":"ADVISORY","url":"https://github.com/mlflow/mlflow/releases/tag/v3.18.0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-127202"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/mlflow-path-traversal-via-model-id-in-log-outputs-api"},{"type":"FIX","url":"https://github.com/mlflow/mlflow/commit/ab5fc795eedc22348253cf687818cf2a16c15282"},{"type":"FIX","url":"https://github.com/mlflow/mlflow/pull/27131"},{"type":"PACKAGE","url":"https://github.com/mlflow/mlflow"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mlflow/mlflow","events":[{"introduced":"0"},{"fixed":"ba41106d110b67096384da12b6b85473457598db"},{"fixed":"ab5fc795eedc22348253cf687818cf2a16c15282"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"3.18.0"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"original_tag":"v3.18.0","range":[{"fixed":"ba41106d110b67096384da12b6b85473457598db"}],"source":"REFERENCES_TAG"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"ab5fc795eedc22348253cf687818cf2a16c15282"}]}]}}],"versions":["ts/typesafe/v0.4.0","ts/v0.4.0","ts/v0.3.1","ts/v0.3.0","ts/v0.3.0-rc.0","ts/v0.2.0","ts/v0.2.0-rc.2","ts/v0.2.0-rc.1","nightly","v3.0.0","v2.2.0","v1.7.0","1.0.0","v0.8.1","v0.8.0","v0.7","v0.6.0","v0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.0","v0.2.1","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-127202.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}