What is CVE-2026-64849?
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.
Timeline
- 2026-08-17Published to the U.S. National Vulnerability Database (NVD)
- 2026-08-19Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-08-20NVD record last updated
- 2026-09-02CISA federal remediation deadline (BOD 22-01)
CISA Known Exploited Vulnerability
MLflow Server-Side Request Forgery Vulnerability
Affected product
Lfprojects Mlflow
Remediation Steps
- Apply the vendor patch for CVE-2026-64849
- Review GitHub account access logs for suspicious activity
- Audit repository permissions and recent changes
- Enable additional authentication factors if not already in place
References
- https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j
- https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939
- https://github.com/mlflow/mlflow/pull/24258
- https://nvd.nist.gov/vuln/detail/CVE-2026-64849
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 3 of August 2026 (August 17 – 23)
Browse all tracked CVEs in the defend.network CVE database →
🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.