GHSA-mw35-8rx3-xf9r: ray (CVE-2026-41486)

Package	Ecosystem	Affected	Fixed in
ray	PyPI	>=2.49.0, <2.55.0	2.55.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Ray (PyPI, not to be confused with other packages named ray; the advisory's package is ray) versions 2.49.0 up to but not including 2.55.0 are affected. An attacker who can get a crafted Parquet file read by a Ray Data pipeline, or any PyArrow Parquet read in the same process, can achieve arbitrary code execution during schema parsing, with no authentication or cluster access required. Upgrade to Ray 2.55.0 or later; the source lists no workaround.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.9	High	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0047, the 41st percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

8 May 2026, 22:16 UTC Confirmed by NVD
31 Oct 2026, 14:11 UTC First seen by agentprime
31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.