{"affected":[{"defaultStatus":"unaffected","ecosystem":"pypi","packageName":"mlflow","product":"mlflow","source":"CNA: VulnCheck","vendor":"mlflow","versions":[{"lessThan":"3.18.0","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-127202","cwes":["CWE-22"],"description":"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.3,"severity":"medium","source":"CNA: VulnCheck","vector":"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","version":"4.0"},{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},{"score":6.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":5.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}],"modifiedAt":1794503863603,"publishedAt":1794501422081,"references":[{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/mlflow/mlflow/releases/tag/v3.18.0"},{"source":"CNA: VulnCheck","tags":["issue-tracking","patch"],"url":"https://github.com/mlflow/mlflow/pull/27131"},{"source":"CNA: VulnCheck","tags":["patch","issue-tracking"],"url":"https://github.com/mlflow/mlflow/commit/ab5fc795eedc22348253cf687818cf2a16c15282"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/mlflow-path-traversal-via-model-id-in-log-outputs-api"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/mlflow/mlflow/commit/ab5fc795eedc22348253cf687818cf2a16c15282"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/mlflow/mlflow/pull/27131"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/mlflow/mlflow/releases/tag/v3.18.0"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/mlflow-path-traversal-via-model-id-in-log-outputs-api"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/mlflow/mlflow/pull/27131"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/mlflow/mlflow/commit/ab5fc795eedc22348253cf687818cf2a16c15282"}],"revision":"67ebfc2ee96e3aa8848f22cb6518f8e4d51f3571be3802ac04e54dcbfea447e7","sources":[{"modifiedAt":1794501422081,"name":"CNA: VulnCheck","retrievedAt":1794503451197,"url":"https://www.cve.org/CVERecord?id=CVE-2026-127202"},{"modifiedAt":1794503863603,"name":"NVD","retrievedAt":1794507524914,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-127202"}],"ssvc":null,"status":"published","title":"MLflow < 3.18.0 Path Traversal via model_id in log_outputs API","updatedAt":1794507524914}