CVE-2026-4035

Published Jun 3, 2026

Last updated 3 days ago

Overview

Description
A vulnerability in mlflow/mlflow versions prior to 3.11.0 allows for the resolution of environment variables in AI Gateway secrets, which can be exploited to exfiltrate sensitive server-side environment credentials to an attacker-controlled endpoint. This issue arises because the `api_key` field in gateway secrets can accept `$ENV_VAR` references, which are resolved against the MLflow server's environment during runtime. The resolved secrets are then sent in provider authentication headers to the configured upstream `api_base`. This vulnerability can be exploited by low-privileged authenticated users in basic-auth deployments or by unauthenticated users in default deployments without `basic-auth`. The impact includes potential leakage of sensitive credentials such as cloud artifact credentials (`AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`), which could lead to artifact poisoning and cross-boundary code execution in downstream environments. The issue is fixed in version 3.11.0.
Source
security@huntr.dev
NVD status
Analyzed
Products
mlflow

Risk scores

CVSS 3.1

Type
Primary
Base score
7.7
Impact score
4
Exploitability score
3.1
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Severity
HIGH

CVSS 3.0

Type
Secondary
Base score
9.1
Impact score
5.3
Exploitability score
3.1
Vector string
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
Severity
CRITICAL

Weaknesses

security@huntr.dev
CWE-201

Social media

Hype score
Not currently trending

Configurations