{"id":"CVE-2026-41486","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-41486","generatedAt":"2026-10-28T05:59:18.367Z","title":"When PyArrow reads a Parquet file containing one of these extension types, it calls __arrow_ext_deserialize__ on the field's metadata bytes.","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.","published":"2026-05-08T22:16:30.000Z","lastModified":"2026-06-17T10:46:47.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":8.9,"severity":"HIGH","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-94","CWE-502"],"affected":["anyscale/ray"],"epss":{"score":0.00473,"percentile":0.40719,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/ray-project/ray/commit/c02bd31ae31996805868baa446a131a8d304525f","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/ray-project/ray/pull/62056","tags":["Issue Tracking","Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/ray-project/ray/releases/tag/ray-2.55.0","tags":["Product","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/ray-project/ray/security/advisories/GHSA-mw35-8rx3-xf9r","tags":["Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-41486","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}