{"id":"BIT-mlflow-2026-53995","summary":"MLflow 3.17.1 and prior Path Traversal via Trace ID API","details":"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.","aliases":["CVE-2026-53995","GHSA-wqmh-qccw-pqwf"],"modified":"2026-10-26T08:55:45.131986681Z","published":"2026-10-26T05:51:59.928Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:python:*:*"]},"references":[{"type":"WEB","url":"https://github.com/SaiTeja-Erukude/CVE-2026-53995-mlflow-path-traversal"},{"type":"WEB","url":"https://github.com/mlflow/mlflow/pull/26842"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53995"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/mlflow-path-traversal-via-trace-id-api"}],"affected":[{"package":{"name":"mlflow","ecosystem":"Bitnami","purl":"pkg:bitnami/mlflow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"3.17.2"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mlflow/BIT-mlflow-2026-53995.json"},"severity":[{"type":"CVSS_V4","score":"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/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"}]}],"schema_version":"1.9.0"}