Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-08-17T21:16:10 mlflow: MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding) 8.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N CWE-918

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.

A flaw was found in MLflow. An unauthenticated remote attacker can exploit a Server-Side Request Forgery (SSRF) vulnerability by sending a specially crafted request to the webhook test endpoint. This occurs because the system validates only the initial URL, but then follows unvalidated HTTP redirects, allowing the attacker to bypass security controls. Successful exploitation can lead to information disclosure, enabling access to internal or cloud metadata services and sensitive data.

This flaw is in MLflow Tracking Server webhook delivery. An attacker who can reach the MLflow API can abuse POST /api/2.0/mlflow/webhooks/{id}/test to trigger SSRF and read upstream response bodies. Upstream rates this against the default unauthenticated mlflow server (PR:N). For OpenShift AI, the operator-managed odh-mlflow-rhel9 image is the primary exposure; the operator enables kubernetes-auth by default, so unauthenticated abuse applies only where MLflow is deployed without authentication. The other 19 RHOAI images embed the mlflow Python package as a client library and do not execute the vulnerable server webhook path in their default role concluding those 19 RHOAI images as Not Affected. Impact is set to Important with PR:L reflecting typical authenticated RHOAI deployments. To reduce the attack surface for this vulnerability, restrict network access to the MLflow server. Implement firewall rules or network access controls to limit connectivity to the MLflow instance from untrusted networks. This operational control helps prevent unauthenticated attackers from reaching the vulnerable webhook test endpoint. Red Hat OpenShift AI 3.4 2026-08-27T00:00:00Z RHSA-2026:60520 rhoai/odh-mlflow-rhel9:1787226790 Red Hat OpenShift AI 3.5 2026-08-26T00:00:00Z RHSA-2026:60367 rhoai/odh-latency-predictor-prediction-rhel9:1786552271 Red Hat OpenShift AI 3.5 2026-08-26T00:00:00Z RHSA-2026:60367 rhoai/odh-latency-predictor-training-rhel9:1786552250 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-pipeline-runtime-tensorflow-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-pipeline-runtime-tensorflow-rocm-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-th06-cpu-torch210-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-th06-cuda130-torch210-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-th06-rocm64-torch291-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-training-cuda128-torch29-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-workbench-jupyter-datascience-cpu-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9 Red Hat OpenShift AI (RHOAI) Not affected rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9 https://www.cve.org/CVERecord?id=CVE-2026-64849 https://nvd.nist.gov/vuln/detail/CVE-2026-64849 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 True