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CVE-2026-41486

Ray: Remote Code Execution via Parquet Arrow Extension Type Deserialization

Published: May 8, 2026Updated: May 18, 2026 Sources: CVE List NVDCWE-94
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.5%
Top 62.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94CWE-502

Affected Products

rayray-project
Library
AI / ML / ml-framework
rayanyscale
SaaS
AI / ML / ml-framework
ray-projectoss-projectUSAI / MLaka ray-project/ray, ray
anyscalecommercialAI / MLaka any scale

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/ray-project/ray/security/advisories/GHSA-mw35-8rx3-xf9r
github.com
https://github.com/ray-project/ray/pull/62056
github.com
https://github.com/ray-project/ray/commit/c02bd31ae31996805868baa446a131a8d304525f
github.com
and 1 more references View all →

Timeline

Published
May 8, 2026
Last Updated
May 18, 2026

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