CVE WatchOct 2, 2026

CVE-2026-64849

MLflow Server-Side Request Forgery Vulnerability

CVSS

9.3

Critical

EPSS

9.8%

p95

KEV

YES

Aug 19, 2026

Exploit Today

0-100

Published: Aug 17, 2026 · Last modified: Oct 2, 2026 · CWE-918

EPSS · 30d

9.8%EPSS · 30 days16.4%

2026-09-042026-10-02

KEV catalog record

Product

MLflow / MLflow

Vulnerability

MLflow Server-Side Request Forgery Vulnerability

Added to KEV

Aug 19, 2026

Remediate by

Sep 2, 2026

Known ransomware use

Summary description

MLflow contains a server-side request forgery vulnerability that can allow attackers to reach internal or cloud metadata services and receive response_status and response_body.

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.

Notes

https://github.com/mlflow/mlflow/pull/24258 ; https://github.com/mlflow/mlflow/issues/24179 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-64849

Technical description

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.

Official references

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