Description
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.
Published: 2026-05-08
Score: 8.9 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-mw35-8rx3-xf9r Ray: Remote Code Execution via Parquet Arrow Extension Type Deserialization
History

Tue, 12 May 2026 02:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 08 May 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Ray Project
Ray Project ray
Vendors & Products Ray Project
Ray Project ray

Fri, 08 May 2026 22:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Ray: Remote Code Execution via Parquet Arrow Extension Type Deserialization
Weaknesses CWE-502
CWE-94
References
Metrics cvssV4_0

{'score': 8.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-12T02:07:57.661Z

Reserved: 2026-04-20T16:14:19.007Z

Link: CVE-2026-41486

cve-icon Vulnrichment

Updated: 2026-05-12T02:07:53.999Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-08T22:16:29.903

Modified: 2026-05-13T16:34:56.063

Link: CVE-2026-41486

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-08T23:30:15Z

Weaknesses