RCE in Anyscale Ray
CVE-2026-41486
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Anyscale Ray — versions 2.54.0
- Ray-Project Ray — versions >= 2.54.0, < 2.55.0
Weakness classification (CWE)
References
- github.com/ray-project/ray/security/advisories/GHSA-mw35-8rx3-xf9r (Vendor Advisory)
- github.com/ray-project/ray/pull/62056 (Patch, Issue Tracking)
- github.com/ray-project/ray/commit/c02bd31ae31996805868baa446a131a8d304525f (Patch)
- github.com/ray-project/ray/releases/tag/ray-2.55.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-41486?
- CVE-2026-41486 is a high-severity vulnerability in Anyscale Ray, classified under Code Injection. CVSS score: 8.8/10. Published 2026-05-08.
- How severe is CVE-2026-41486?
- High severity. CVSS v3 base score is 8.8 out of 10.