{"id":"CVE-2026-2651","aliases":["GHSA-8c7q-86fq-vvmh","BIT-mlflow-2026-2651","PYSEC-2026-2220"],"title":"MLflow allows unauthorized access to multipart upload endpoints when the `--serve-artifacts` mode is enabled","summary":"MLflow allows unauthorized access to multipart upload endpoints when the `--serve-artifacts` mode is enabled","severity":"critical","cvss":9,"cvssVector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","vendor":"mlflow","product":"mlflow","ecosystem":"pip","affected":["mlflow < 3.11.0rc1"],"patched":["mlflow 3.11.0rc1"],"published":"2026-05-26","updated":"2026-07-13","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-8c7q-86fq-vvmh","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2651"},{"url":"https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f"},{"url":"https://access.redhat.com/security/cve/CVE-2026-2651"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2481117"},{"url":"https://github.com/mlflow/mlflow"},{"url":"https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2651.json"}],"tags":["osv","pip"],"epss":0.00345,"epssPercentile":0.2814,"ingestedAt":"2026-07-13T18:57:54.972Z","slug":"CVE-2026-2651","body":"## Overview\n\nA 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.\n\n## Affected packages\n\n- `mlflow < 3.11.0rc1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `mlflow 3.11.0rc1`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":49.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}