CVE-2026-64849 PUBLISHED

MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)

Assigner: GitHub_M
Reserved: 20.07.2026 Published: 17.08.2026 Updated: 17.08.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
CVSS Score: 9.3

Product Status

Vendor mlflow
Product mlflow
Versions
  • Version < 3.15.0 is affected

References

Problem Types

  • CWE-918: Server-Side Request Forgery (SSRF) CWE