CVE-2026-127202
MLflow < 3.18.0 Path Traversal via model_id in log_outputs API
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| mlflow mlflow mlflow
pypi |
≥ 0; < 3.18.0 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.3 medium |
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 | CNA: VulnCheck |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | CNA: VulnCheck |
| 4.0 / 6.3 medium |
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 | NVD: [email protected] |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/mlflow/mlflow/releases/tag/v3.18.0CNA: VulnCheck · release-notes
- https://github.com/mlflow/mlflow/pull/27131CNA: VulnCheck · issue-tracking, patch
- https://github.com/mlflow/mlflow/commit/ab5fc795eedc22348253cf687818cf2a16c15282CNA: VulnCheck · patch, issue-tracking
- https://www.vulncheck.com/advisories/mlflow-path-traversal-via-model-id-in-log-outputs-apiCNA: VulnCheck · third-party-advisory
- https://github.com/mlflow/mlflow/commit/ab5fc795eedc22348253cf687818cf2a16c15282[email protected]
- https://github.com/mlflow/mlflow/pull/27131[email protected]
- https://github.com/mlflow/mlflow/releases/tag/v3.18.0[email protected]
- https://www.vulncheck.com/advisories/mlflow-path-traversal-via-model-id-in-log-outputs-api[email protected]
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