Vulnerability · Published May 8, 2026 · Assigned by GitHub_M

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

High 8.9

In plain English

A high-severity code injection in ray from ray-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.9High

Exploit odds (30 days)0.5%top 58.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	ray	2.55.0	GHSA-mw35-8rx3-xf9r
PyPI	ray	no fix listed	PYSEC-2026-2272
PyPI	ve-ray	no fix listed	PYSEC-2026-2296

Affected products (as reported)

Vendor	Product	Versions
ray-project	ray	>= 2.54.0, < 2.55.0

Weakness: CWE-94, CWE-502 · 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

References

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