CVEs / CVE-2026-2652
CVE-2026-2652: mlflow mlflow/mlflow vulnerability
- high 8.6 CVSS 3.0 (from the CNA)
- EPSS 20.7% chance of exploitation in the next 30 days, higher than 97% of CVEs (30 Oct 2026)
- Last changed at its sources
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Description
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. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the `_find_fastapi_validator()` function fails to handle non-`/gateway/` paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| mlflow mlflow/mlflow | from unspecified, before 3.10.0 | 3.10.0 |
| Product | Affected | Fixed in |
|---|---|---|
| mlflow (PyPI) | before 3.11.0 | 3.11.0 |
Package versions from GHSA-75cm-x2w3-8mgf.
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 30 Oct 2026.
Severity
| CVSS 3.0 | 8.6 highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:LScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-305 |
References
- CVE-2026-2652 on NVD
- CVE-2026-2652 on OSV
- https://github.com/mlflow/mlflow/commit/bb62e773263c14e9ba4d1a82fe72d0de2442c6aa Patch
- https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756 Exploit, Mitigation, Third Party Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.