CVE-2026-4035

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.
Configurations

Configuration 1 (hide)

cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*

History

21 Jul 2026, 19:10

Type Values Removed Values Added
Summary
  • (es) Una vulnerabilidad en las versiones de mlflow/mlflow anteriores a la 3.11.0 permite la resolución de variables de entorno en secretos de AI Gateway, lo que puede ser explotado para exfiltrar credenciales de entorno sensibles del lado del servidor a un punto final controlado por un atacante. Este problema surge porque el campo 'api_key' en los secretos del gateway puede aceptar referencias a '$ENV_VAR', que se resuelven contra el entorno del servidor de MLflow durante el tiempo de ejecución. Los secretos resueltos se envían entonces en los encabezados de autenticación del proveedor al 'api_base' ascendente configurado. Esta vulnerabilidad puede ser explotada por usuarios autenticados con bajos privilegios en implementaciones con 'basic-auth' o por usuarios no autenticados en implementaciones predeterminadas sin 'basic-auth'. El impacto incluye la posible fuga de credenciales sensibles, como credenciales de artefactos en la nube ('AWS_ACCESS_KEY_ID', 'AWS_SECRET_ACCESS_KEY'), lo que podría llevar al envenenamiento de artefactos y a la ejecución de código transfronteriza en entornos descendentes. El problema está solucionado en la versión 3.11.0.

30 Jun 2026, 03:20

Type Values Removed Values Added
References
  • () https://access.redhat.com/security/cve/CVE-2026-4035 -
  • () https://bugzilla.redhat.com/show_bug.cgi?id=2484318 -
  • () https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4035.json -

04 Jun 2026, 19:35

Type Values Removed Values Added
References () https://github.com/mlflow/mlflow/commit/4a3f2f720cb4f058c9e0c5b883e0acc9ab64a7f3 - () https://github.com/mlflow/mlflow/commit/4a3f2f720cb4f058c9e0c5b883e0acc9ab64a7f3 - Patch
References () https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233 - () https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233 - Exploit, Third Party Advisory
CPE cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : 9.1
v2 : unknown
v3 : 7.7
First Time Lfprojects mlflow
Lfprojects

03 Jun 2026, 14:16

Type Values Removed Values Added
References () https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233 - () https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233 -

03 Jun 2026, 09:16

Type Values Removed Values Added
New CVE

Information

Published : 2026-06-03 09:16

Updated : 2026-07-21 19:10


NVD link : CVE-2026-4035

Mitre link : CVE-2026-4035

CVE.ORG link : CVE-2026-4035


JSON object : View

Products Affected

lfprojects

  • mlflow
CWE
CWE-201

Insertion of Sensitive Information Into Sent Data