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9.3
CRITICAL • CVSS 3.1

CVE-2026-64849

CISA KNOWN EXPLOITED

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.

Prioritization

NVD CVSS
9.3
Published
Aug 17, 2026 6:17 PM EDT
Modified
Aug 20, 2026 3:16 PM EDT
CISA KEV
Yes
KEV due date
2026-09-02
CISA required action

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.

Red Hat context

Red Hat severity
important
Red Hat CVSS
8.5
DEFENSIVE REMEDIATION WORKFLOW

Recommended response

  1. Treat as priority because it appears in CISA Known Exploited Vulnerabilities data; follow the required action and due date where applicable.
  2. Identify affected assets with Qualys, Tanium, software inventory, CMDB or configuration-management data.
  3. Confirm package/application applicability before change execution; CVSS alone does not prove that every host is vulnerable.
  4. Patch, upgrade, rehydrate or apply a vendor-approved mitigation through controlled change. GraceITS can automate eligible waves with Ansible/Tanium.
  5. Rescan after remediation and reconcile remaining exceptions, false positives, unsupported systems and compensating controls.
Ask GraceITS to remediate this CVE NVD record ↗ Red Hat record ↗