CVE-2026-2651

Summary

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.

Affected Software

Weaknesses

• CWE-862: CWE-862 Missing Authorization

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc

github.com/mlflow/mlflow: MLflow: Arbitrary code execution via unauthorized multipart upload access

Additional References

• https://access.redhat.com/security/cve/CVE-2026-2651
• https://bugzilla.redhat.com/show_bug.cgi?id=2481117
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2651.json

References

• https://huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc
• https://github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f

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