CVE-2026-2652: A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI r

Q: How do I fix CVE-2026-2652?

mlflow: upgrade to 3.10.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-2652 being exploited?

CVE-2026-2652 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-2652 affect?

CVE-2026-2652 affects mlflow. Severity is high (CVSS 8.6). A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (`--app-name basic-auth`) and served via uvicorn (ASGI). The FastAPI

Q: How urgent is CVE-2026-2652?

Priority 64/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.6REMOTEUPGRADE

CVE-2026-2652 is a high-severity flaw (CVSS 8.6) affecting mlflow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (`--app-name basic-auth`) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on `/gateway/` routes, leaving other routes such as the Job API (`/ajax-api/3.0/jobs/*`) and the OpenTelemetry trace ingestion API (`/v1/traces`) unprotected.

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	20.8% (top 2%)
CISA exploited list	No
Weakness	CWE-305
Published	2026-05-15
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: lfprojects

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-15 03:16 UTCPublished CVE record published
2026-06-17 10:31 UTCUpdated Record last modified

lfprojects mlflow UPGRADE

Affected: < 3.10.0

Fixed in: 3.10.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mlflow || rpm -q mlflow || mlflow --version

2. UPGRADE to 3.10.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mlflow

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mlflow

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Python (pip) · mlflow · FIXED · 3.11.0 · vulnerable: < 3.11.0 · source

pip install --upgrade "mlflow>=3.11.0" pip show mlflow

Fedora 46 · proftpd · FIXED · 1.3.9e-1.fc46 · FEDORA-2026-fc0d87d66e · source

sudo dnf upgrade --advisory=FEDORA-2026-fc0d87d66e

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: MLflow < 3.10.0 - Authentication Bypass on FastAPI Routes

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-2652?

mlflow: upgrade to 3.10.0. Exact commands for each OS are on this page.

Is CVE-2026-2652 being exploited?

CVE-2026-2652 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-2652 affect?

CVE-2026-2652 affects mlflow. Severity is high (CVSS 8.6). A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (`--app-name basic-auth`) and served via uvicorn (ASGI). The FastAPI

How urgent is CVE-2026-2652?

Priority 64/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

FastAPI vulnerabilities

Related CVEs

CVE-2026-64849 CRITICAL 9.3 EXPLOITED UPGRADE MLflow Server-Side Request Forgery Vulnerability
CVE-2026-8147 HIGH 8.1 UPGRADE In MLflow versions prior to 3.14.0, when running with authentication enabled, the trace API endpoints lack pro
CVE-2026-2611 CRITICAL 9.6 UPGRADE In MLflow version 3.9.0, the MLflow Assistant feature introduced improper origin validation in its /ajax-api e
CVE-2026-2614 HIGH 7.5 UPGRADE A vulnerability in the `_create_model_version()` handler of `mlflow/server/handlers.py` in mlflow/mlflow versi
CVE-2026-0545 CRITICAL 9.8 MITIGATE In mlflow/mlflow, the FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication o

References

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