---
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
vendor: xorbitsai
product: xoscar
affected:
  - xoscar >= 0.1.0 <= 0.11.2
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:25:45.343'
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
  - url: 'https://www.vulncheck.com/blog/xorbits-xoscar-unauth-cloudpickle-rce'
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.0085
epssPercentile: 0.57966
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-14T17:00:37.058721Z'
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.