{"id":"CVE-2026-2651","aliases":["BIT-mlflow-2026-2651","GHSA-8c7q-86fq-vvmh","PYSEC-2026-2220"],"url":"https://o3.security/vulnerability/CVE-2026-2651","summary":"Missing Authorization Validation in mlflow/mlflow","details":"A vulnerability in MLflow versions <=3.10.1.dev0 allows unauthorized access to multipart upload (MPU) endpoints when the `--serve-artifacts` mode is enabled. The authorization logic does not enforce resource-level permission checks for `/mlflow-artifacts/mpu/*` endpoints, enabling attackers to overwrite artifacts belonging to other users. This can lead to unauthorized cross-user writes, model supply chain poisoning, and arbitrary code execution when compromised models are loaded. The issue is resolved in version 3.10.0.","published":"2026-05-25T06:00:34.002Z","modified":"2026-08-12T03:51:19.430621551Z","cvss":{"score":9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H"},"epss":{"score":0.00345,"percentile":0.27571,"asOf":"2026-08-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"mlflow","fixedVersion":"3.11.0rc1"}],"fix":{"url":"https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f","label":"mlflow/mlflow@d729081"},"references":[{"type":"WEB","url":"https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2651.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-2651"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2651.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2651"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2481117"},{"type":"FIX","url":"https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:19.430621551Z"}}