{"id":"CVE-2026-53995","summary":"MLflow 3.17.1 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.","modified":"2026-10-20T12:00:20.487116080Z","published":"2026-10-19T21:05:16.530Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53995.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-22"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53995.json"},{"type":"EVIDENCE","url":"https://github.com/SaiTeja-Erukude/CVE-2026-53995-mlflow-path-traversal"},{"type":"PACKAGE","url":"https://github.com/mlflow/mlflow"},{"type":"REPORT","url":"https://github.com/mlflow/mlflow/pull/26842"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53995"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/mlflow-path-traversal-via-trace-id-api"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mlflow/mlflow","events":[{"introduced":"0"},{"last_affected":"7fc49ae9fcd65ed125e46cf68b976060e5a38c77"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"3.17.1"}]}}],"versions":["v3.17.1","v3.17.0","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","model-catalog/latest","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-2026-53995.json"}}],"schema_version":"1.9.0","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"}]}