CVE-2026-41486: Anyscale Ray

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Ray is an AI compute engine. From version 2.54.0 to before version 2.55.0, Ray Data registers custom Arrow extension types (ray.data.arrow_tensor, ray.data.arrow_tensor_v2, ray.data.arrow_variable_shaped_tensor) globally in PyArrow. When PyArrow reads a Parquet file containing one of these extension types, it calls __arrow_ext_deserialize__ on the field's metadata bytes. Ray's implementation passes these bytes directly to cloudpickle.loads(), achieving arbitrary code execution during schema parsing, before any row data is read. This issue has been patched in version 2.55.0.

Affected products

• Anyscale Ray: version 2.54.0 only

Published 2026-05-08. Last modified 2026-06-17.