CVE-2026-64849MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)
Known exploited — MLflow Server-Side Request Forgery Vulnerability
CISA confirmed this vulnerability is used in real attacks on 19.08.2026. Remediation deadline for US federal agencies: 02.09.2026.
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. 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
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.
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| lfprojects | mlflow | 3.3.0 – < 3.15.0 | |
| mlflow | mlflow | >= 3.3.0, < 3.15.0 |
References and patches
- https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j ExploitVendor Advisory
- https://github.com/mlflow/mlflow/issues/24179 ExploitIssue TrackingMitigation
- https://github.com/mlflow/mlflow/pull/24258 Issue TrackingPatch
- https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939 Patch
- https://github.com/mlflow/mlflow/releases/tag/v3.15.0 Release Notes
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-64849 US Government Resource
CPE matches (NVD) (1)
cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*≥ 3.3.0 < 3.15.0