MSRXCVE-2026-64849
CVE-2026-64849
MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)
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.
CVSS 3.1 · CNA
chance of exploitation in the next 30 days (EPSS; higher than 95% of CVEs)
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.
Scores
Affected packages and fixed versions
| Package | Ecosystem | Fixed in |
|---|---|---|
| mlflow | PyPI | 3.15.0 |
Affected products
- mlflow mlflow: >= 3.3.0, < 3.15.0
Weakness: CWE-918
Also known as: BIT-mlflow-2026-64849, GHSA-7gwp-5pfp-969j, PYSEC-2026-3687
5 references (advisories, patches, write-ups)
- https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j · x_refsource_CONFIRM
- https://github.com/mlflow/mlflow/issues/24179 · x_refsource_MISC
- https://github.com/mlflow/mlflow/pull/24258 · x_refsource_MISC
- https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939 · x_refsource_MISC
- https://github.com/mlflow/mlflow/releases/tag/v3.15.0 · x_refsource_MISC
Sources: CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.