CVE-2026-64849

What is CVE-2026-64849?

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.

Timeline

• 2026-08-17Published to the U.S. National Vulnerability Database (NVD)
• 2026-08-19Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
• 2026-08-22First covered in a defend.network daily briefing
• 2026-09-02CISA federal remediation deadline (BOD 22-01)
• 2026-10-02NVD record last updated

CISA Known Exploited Vulnerability

MLflow Server-Side Request Forgery Vulnerability

Affected product

Lfprojects Mlflow

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 2 of September 2026 (September 14 – 20)
• Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
• Vulnerability Priority Report – Week 5 of August 2026 (August 31 – September 6)
• Vulnerability Priority Report – Week 4 of August 2026 (August 24 – 30)
• Vulnerability Priority Report – Week 3 of August 2026 (August 17 – 23)
• Trojanized npm packages, AWS credential leak, Microsoft Defender driver abuse (2026-08-22)