CVE-2026-64849

critical

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.

References

Exploits
More

https://www.databreachtoday.com/mlflow-flaw-opens-path-to-cloud-credentials-theft-a-32626

https://www.securityweek.com/mlflow-vulnerability-exploited-for-cloud-credential-theft/

https://www.bleepingcomputer.com/news/security/cisa-warns-of-hackers-exploiting-critical-mlflow-vulnerability/

https://securityaffairs.com/197558/hacking/u-s-cisa-adds-a-mlflow-flaw-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/08/19/cisa-adds-one-known-exploited-vulnerability-catalog

https://thehackernews.com/2026/08/attackers-exploit-mlflow-ssrf-flaw-to.html

https://github.com/zavisco/CVE-2026-64849.yaml

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-64849

https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j

https://github.com/mlflow/mlflow/releases/tag/v3.15.0

https://github.com/mlflow/mlflow/pull/24258

https://github.com/mlflow/mlflow/issues/24179

https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-60473

Details

Source: Mitre, NVD

Published: 2026-08-17

Updated: 2026-10-02

Named Vulnerability: GHSA-7gwp-5pfp-969jKnown Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 8.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:N

Severity: High

CVSS v3

Base Score: 9.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Severity: Critical

EPSS

EPSS: 0.00349