MLflow Server-Side Request Forgery Vulnerability
MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. Prior to 3.15.0, the unauthenticated POST /api/2.0/mlflow/webhooks/{id}/test endpoint calls _validate_webhook_url() in mlflow/utils/validation.py only for the original URL while mlflow/webhooks/delivery.py follows redirects and re-resolves the hostname without pinning the validated address, allowing attackers to reach internal or cloud metadata services and receive response_status and response_body. This issue is fixed in version 3.15.0.
MANARTECH SECURITY ALERT
MLflow Server-Side Request Forgery Vulnerability
CVE Numbers
CVE-2026-64849
Affected Product
MLflow — MLflow
Threat Description
MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. Prior to 3.15.0, the unauthenticated POST /api/2.0/mlflow/webhooks/{id}/test endpoint calls _validate_webhook_url() in mlflow/utils/validation.py only for the original URL while mlflow/webhooks/delivery.py follows redirects and re-resolves the hostname without pinning the validated address, allowing attackers to reach internal or cloud metadata services and receive response_status and response_body. This issue is fixed in version 3.15.0.
Severity Scale
CRITICALHIGHMEDIUMLOW
Severity
CRITICAL
Affected Versions
To be reviewed
Recommended Mitigation
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Reference Links
https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939
https://github.com/mlflow/mlflow/issues/24179
https://github.com/mlflow/mlflow/pull/24258
https://github.com/mlflow/mlflow/releases/tag/v3.15.0
https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-64849
https://nvd.nist.gov/vuln/detail/CVE-2026-64849