CVSS 4.0
8.9 highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HCVE-2026-41486
High (8.9) in anyscale ray. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in ray 2.55.0.
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.
Severity
CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-94, CWE-502
- Published
- Modified
- Record from
- the NVD, synced
Affected
- anyscale:ray
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-mw35-8rx3-xf9r | PyPI | ray | >=2.49.0 <2.55.0 | 2.55.0 |
| PYSEC-2026-2272 | PyPI | ray | <=2.54.0 | no fix published |
| PYSEC-2026-2296 | PyPI | ve-ray | <=2.54.0 | no fix published |