CVE-2026-64849: MLflow Server-Side Request Forgery Vulnerability
Vulnerability summary
CVE-2026-64849 is a critical (CVSS 9.3) Server-Side Request Forgery (SSRF) vulnerability in MLflow. It is known to be exploited: CISA lists it, first on 19-08-2026. EPSS estimates a 9.84% chance of exploitation in the next 30 days, higher than 95.5% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 17-08-2026PublishedVulnerability first disclosed.
- 19-08-2026Added to CISA KEVMLflow Server-Side Request Forgery Vulnerability
- 02-09-2026CISA remediation dueApply mitigations per vendor instructions.
- 02-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · PypiEcosystem advisory · calculated9.3CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
- NVDNIST9.3CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
EPSS trend
Probability
9.84%
Chance of exploitation in the next 30 days
Percentile
96%
Versus all other CVEs
30-day change
-6.57 pp
From 16.41% on 21-09-2026
Known exploited
Compare KEV catalogs
CISA KEVListed- Added
- 19-08-2026
- Federal due date
- 02-09-2026
CISA 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. github.com/mlflow/mlflow/pull/24258 github.com/mlflow/mlflow/issues/24179 nvd.nist.gov/vuln/detail/CVE-2026-64849
Public exploits
1 foundMlflow
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Chainguard1 product
- mlflow< 3.16.0-r0
Lfprojects1 product
- mlflow≥ 3.3.0, < 3.15.0
Mlflow1 product
- mlflow≥ 3.3.0, < 3.15.0
PyPI1 product
- mlflow≥ 3.3.0, < 3.15.0 | < 3.15.0
Wolfi1 product
- mlflow< 3.16.0-r0
5 vendors · 5 products
References
11 links- github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969jX Refsource CONFIRMWEBExploitVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-64849Government ResourceWEBUS Government Resource
- github.com/mlflow/mlflowPACKAGE