CVE-2026-3198: MLflow 3.9.0 with basic-auth (`--app-name basic-auth`) fails to enforce authorization checks for multiple Gate

Routine

MEDIUM 6.5DOWNGRADE

CVE-2026-3198 is a medium-severity flaw (CVSS 6.5) affecting mlflow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MLflow 3.9.0 with basic-auth (`--app-name basic-auth`) fails to enforce authorization checks for multiple Gateway API 'list' endpoints. Specifically, the `BEFORE_REQUEST_HANDLERS` dictionary in `mlflow/server/auth/__init__.py` does not include entries for `ListGatewaySecretInfos`, `ListGatewayEndpoints`, and `ListGatewayModelDefinitions`. This allows any authenticated user, regardless of their assigned permissions, to enumerate all gateway secret

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-06-02
Last modified	2026-07-21

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

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-02 04:17 UTCPublished CVE record published
2026-07-21 19:10 UTCUpdated Record last modified

lfprojects mlflow DOWNGRADE

Affected: 3.9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.9.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.9.0 (Debian / Ubuntu)

apt-cache madison mlflow sudo apt install mlflow=<VERSION_BEFORE_3.9.0> sudo apt-mark hold mlflow

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mlflow sudo dnf downgrade mlflow-<VERSION_BEFORE_3.9.0> sudo dnf versionlock add mlflow

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-3198?

mlflow: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-3198 being exploited?

CVE-2026-3198 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-2026-3198 affect?

CVE-2026-3198 affects mlflow. Severity is medium (CVSS 6.5). MLflow 3.9.0 with basic-auth (`--app-name basic-auth`) fails to enforce authorization checks for multiple Gateway API 'list' endpoints. Specifically, the `BEFORE_REQUEST_HANDLERS` dictionary in `mlflow/server/auth/__init__.py` does not incl

How urgent is CVE-2026-3198?

Priority 32/100. Public exploit reference

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References

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