---
id: CVE-2026-49950
title: >-
  Xorbits Xoscar through 0.11.2 contains an unauthenticated deserialization
  vulnerability that allows remote attackers to execute arbitrary code by
  sending crafted data over the actor-pool TCP channel
summary: >-
  Xorbits Xoscar through 0.11.2 contains an unauthenticated deserialization
  vulnerability that allows remote attackers to execute arbitrary code by
  sending crafted data over the actor-pool TCP channel. Attackers can exploit
  SocketChannel.r…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-502
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:17:39.007'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49950'
references:
  - url: >-
      https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/backends/communication/socket.py#L99-L104
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/serialization/core.pyx#L260
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/xorbits-xoscar-unauthenticated-deserialization-rce-via-actor-pool
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-13T21:58:14.181Z'
---

## Overview

Xorbits Xoscar through 0.11.2 contains an unauthenticated deserialization vulnerability that allows remote attackers to execute arbitrary code by sending crafted data over the actor-pool TCP channel. Attackers can exploit SocketChannel.recv() passing unvalidated data to cloudpickle.loads(), which triggers pickle __reduce__ gadget execution before message type validation, achieving remote code execution as the server process which commonly runs as root on GPU nodes.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.