CVE-2026-4035
Environment Variable Resolution Vulnerability in mlflow/mlflow
En bref
- Source
- NVD
- EPSS
- EPSS 0.52 % · centile 44 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- @huntr_ai
- Statut NVD
- Modified
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.
Faiblesses (CWE)
- CWE-201 — Insertion of Sensitive Information Into Sent Data
Références
- https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233
- https://github.com/mlflow/mlflow/commit/4a3f2f720cb4f058c9e0c5b883e0acc9ab64a7f3
- 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
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.0 | CRITICAL 9.1 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L | @huntr_ai |
| CVSS 3.1 | HIGH 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | redhat-SADP |
| CVSS 3.1 | HIGH 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | NVD · nvd@nist.gov (Primary) |
| CVSS 3.1 | HIGH 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
| CVSS 3.0 | CRITICAL 9.1 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L | NVD · security@huntr.dev (Secondary) |
Avis
- GHSA-g35p-px32-whv6 — MLflow: Environment variable injection in AI Gateway secrets enables server-side credential exfiltration
- PYSEC-2026-2222 — 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 ex
Références européennes
- ENISA EUVD · EUVD-2026-34068
- GCVE · GCVE-0-2026-4035
Configurations affectées (CPE NVD)
cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*< 3.11.0
Produits affectés
| Produit | Versions |
|---|---|
| mlflow · mlflow/mlflow | affected unspecified < 3.11.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |