CVE-2026-64849MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)
MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. Starting in 3.3.0 and 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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.3 | CRITICAL | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N |
CISA required action
⚡ Known exploited · remediation due Sep 2, 2026
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.
Details
- CVE ID
- CVE-2026-64849
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Aug 17, 2026
- Last modified
- 2026-10-26 13:10 UTC
- Weaknesses
- CWE-918 · Server-Side Request Forgery (SSRF)
Affected Products
As published by the CNA in the CVE record.
mlflowmlflow1 version range
- >= 3.3.0, < 3.15.0
References
- github.com https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939
- github.com https://github.com/mlflow/mlflow/issues/24179
- github.com https://github.com/mlflow/mlflow/pull/24258
- github.com https://github.com/mlflow/mlflow/releases/tag/v3.15.0
- github.com https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-64849