CVE-2026-64849
KEV: known exploited SSVC: activeMLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vectorThis vulnerability may be exploitable over the internet without authentication or user interaction.
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | C | Changed (affects other components) |
| Confidentiality C | H | High |
| Integrity I | L | Low |
| Availability A | N | None |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
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.
CISA KEV entry
MLflow Server-Side Request Forgery Vulnerability — MLflow / MLflow
MLflow contains a server-side request forgery vulnerability that can allow attackers to reach internal or cloud metadata services and receive response_status and response_body.
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.
https://github.com/mlflow/mlflow/pull/24258 ; https://github.com/mlflow/mlflow/issues/24179 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-64849
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 3.1 | 9.3 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N |
| CNA / GitHub_M | 3.1 | 9.3 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| mlflow | mlflow | affected: >= 3.3.0, < 3.15.0 |
NVD CPE (1)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| lfprojects | mlflow | >= 3.3.0, < 3.15.0 | cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:* |
Open-source packages (GitHub Advisory / OSV)
MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)
| Ecosystem | Package | Affected versions | Fixed in |
|---|---|---|---|
| PyPI | mlflow | >= 3.3.0, < 3.15.0 | 3.15.0 |
MLflow: Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed via unvalidated HTTP redirects (and DNS rebinding)
| Ecosystem | Package | Affected versions | Fixed in |
|---|---|---|---|
| PyPI | mlflow | < 3.15.0 0.0.1, 0.1.0, 0.2.0, 0.2.1, 0.3.0, 0.4.0, 0.4.1, 0.4.2, 0.5.0, 0.5.1, 0.5.2, 0.6.0, 0.7.0, 0.8.0, 0.8.1, 0.8.2, 0.9.0, 0.9.0.1, 0.9.1, 1.0.0, … (+162) | 3.15.0 |
Linux distribution status
References (13)
- https://access.redhat.com/errata/RHSA-2026:60367 Red Hat RHSA-2026:60367
- https://access.redhat.com/errata/RHSA-2026:60520 Red Hat RHSA-2026:60520
- https://github.com/advisories/GHSA-7gwp-5pfp-969j GHSA, OSV
- https://github.com/mlflow/mlflow GHSA, OSV
- https://github.com/mlflow/mlflow/commit/ba949522477cbd5915aa55d29b0cfad7d5ddf939 NVD, CNA, GHSA, OSV Patchx_refsource_MISC
- https://github.com/mlflow/mlflow/issues/24179 NVD, CNA, GHSA, OSV ExploitIssue TrackingMitigationx_refsource_MISC
- https://github.com/mlflow/mlflow/pull/24258 NVD, CNA, GHSA, OSV Issue TrackingPatchx_refsource_MISC
- https://github.com/mlflow/mlflow/releases/tag/v3.15.0 NVD, CNA, GHSA, OSV Release Notesx_refsource_MISC
- https://github.com/mlflow/mlflow/security/advisories/GHSA-7gwp-5pfp-969j NVD, CNA, GHSA, OSV ExploitVendor Advisoryx_refsource_CONFIRM
- https://github.com/pypa/advisory-database/tree/main/vulns/mlflow/PYSEC-2026-3687.yaml GHSA
- https://nvd.nist.gov/vuln/detail/CVE-2026-64849 GHSA, OSV
- https://pypi.org/project/mlflow GHSA, OSV
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-64849 NVD, ADP CISA-ADP, GHSA US Government Resourcegovernment-resource