What’s Vulnerable › Vulnerabilities

CVE-2026-41486: Ray: Remote Code Execution via Parquet Arrow Extension Type Deserialization

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17
• Weakness: CWE-94

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.

Affected products

• ray-project ray: 2.54.0

References

• https://github.com/ray-project/ray/commit/c02bd31ae31996805868baa446a131a8d304525f
• https://github.com/ray-project/ray/pull/62056
• https://github.com/ray-project/ray/releases/tag/ray-2.55.0
• https://github.com/ray-project/ray/security/advisories/GHSA-mw35-8rx3-xf9r

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