# CVE-2026-4035

## Summary

- **CVE ID:** CVE-2026-4035
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L)
- **CWE:** CWE-201
- **Published:** Jun 3, 2026
- **Last Modified:** Aug 14, 2026

## 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.

## Affected Products

- mlflow — mlflow/mlflow (unspecified)

## References

- [CNA](https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233)
- [CNA](https://github.com/mlflow/mlflow/commit/4a3f2f720cb4f058c9e0c5b883e0acc9ab64a7f3)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-4035)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2484318)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4035.json)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.52%
- **EPSS Percentile:** 42.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._