CVE-2026-2614: Arbitrary File Read via Prompt Tag Source Validation Bypass in mlflow/mlflow

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-11 · updated 2026-08-28
Weakness: CWE-22

Description

A vulnerability in the `_create_model_version()` handler of `mlflow/server/handlers.py` in mlflow/mlflow versions 3.9.0 and earlier allows an unauthenticated remote attacker to read arbitrary files from the server's filesystem. The issue arises when a `CreateModelVersion` request includes the tag `mlflow.prompt.is_prompt`, which bypasses source path validation. This enables an attacker to store an arbitrary local filesystem path as the model version source. The `get_model_version_artifact_handler()` function later uses this source to serve files without verifying the model version's prompt status, leading to a complete confidentiality compromise. This issue is fixed in version 3.10.0.

Affected products

mlflow/mlflow: before 3.10.0 — fixed in 3.10.0

How to fix

Upgrade to a fixed version: mlflow/mlflow 3.10.0. Check the vendor advisory for mitigations.

References

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