{"id":"CVE-2026-53995","aliases":[],"title":"MLflow 3.17.1 and prior Path Traversal via Trace ID API","titleSource":"VulnCheck","descriptionSource":"VulnCheck","products":[{"vendor":"mlflow","name":"mlflow","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"3.17.1","versionType":"semver"}],"defaultStatus":"unknown","source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-53995"}],"remediation":[],"description":"MLflow 3.17.1 and earlier contains a path traversal vulnerability in the FileStore tracking backend that allows unauthenticated attackers to control filesystem paths by submitting a crafted trace ID containing traversal sequences to the POST /api/3.0/mlflow/traces endpoint. Attackers can exploit FileStore.start_trace() to write trace_info.yaml, request_metadata, and tag files with attacker-controlled metadata outside the intended experiment trace directory, subject to the server process's filesystem permissions. FileStore is the default tracking backend before MLflow 3.7.0 and opt-in thereafter (the default changed to a SQLite database), so deployments in the earlier part of the affected range are vulnerable without special configuration while later ones are affected only when FileStore is explicitly selected.","severity":"high","score":8.8,"published":"2026-10-19T21:05:16.530Z","modified":"2026-10-27T10:14:10.190Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/SaiTeja-Erukude/CVE-2026-53995-mlflow-path-traversal","https://github.com/mlflow/mlflow/pull/26842","https://www.vulncheck.com/advisories/mlflow-path-traversal-via-trace-id-api"],"sources":[{"name":"CVE","id":"CVE-2026-53995","modified":"2026-10-27T10:14:10.190Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-53995"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","score":8.8},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","score":8.2}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T20:45:31.448Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}