{"id":"BIT-mlflow-2026-4035","summary":"Environment Variable Resolution Vulnerability in mlflow/mlflow","details":"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.","aliases":["CVE-2026-4035","GHSA-g35p-px32-whv6","PYSEC-2026-2222"],"modified":"2026-09-10T16:01:43.090928099Z","published":"2026-06-05T08:52:23.138Z","database_specific":{"severity":"Critical","cpes":["cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*"]},"references":[{"type":"FIX","url":"https://github.com/mlflow/mlflow/commit/4a3f2f720cb4f058c9e0c5b883e0acc9ab64a7f3"},{"type":"ADVISORY","url":"https://huntr.com/bounties/f8e591a0-0f19-4910-b82e-16c9956f2233"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4035"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-4035"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2484318"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4035.json"}],"affected":[{"package":{"name":"mlflow","ecosystem":"Bitnami","purl":"pkg:bitnami/mlflow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.11.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mlflow/BIT-mlflow-2026-4035.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L"}]}],"schema_version":"1.9.0"}