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CVE-2026-4035— Environment Variable Resolution Vulnerability in mlflow/mlflow

Quick assessment

Affected
mlflow mlflow/mlflow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MLflow是MLflow开源的一个简化机器学习开发的平台，包括跟踪实验、将代码打包成可重复的运行以及共享和部署模型。 MLflow 3.11.0之前版本存在安全漏洞，该漏洞源于AI Gateway secrets中环境变量解析问题，可能导致敏感凭据泄露。

AI Predicted 9.1 Difficulty: Easy EPSS 0.66% · P50

Affected Version Matrix 1

VendorProduct Version RangeStatus
mlflow mlflow/mlflow unspecified< 3.11.0 affected
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I. Basic Information for CVE-2026-4035

Vulnerability Information
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Vulnerability Title
Environment Variable Resolution Vulnerability in mlflow/mlflow
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
MLflow 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MLflow是MLflow开源的一个简化机器学习开发的平台，包括跟踪实验、将代码打包成可重复的运行以及共享和部署模型。 MLflow 3.11.0之前版本存在安全漏洞，该漏洞源于AI Gateway secrets中环境变量解析问题，可能导致敏感凭据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mlflow mlflow/mlflow unspecified ~ 3.11.0 -

II. Public POCs for CVE-2026-4035

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III. Intelligence Information for CVE-2026-4035

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Patches & Fixes for CVE-2026-4035 (1)

IV. Related Vulnerabilities

Same product: mlflow/mlflow
Same vendor: mlflow
Same weakness: CWE-201

V. Comments for CVE-2026-4035

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