Unauthenticated Deserialization Vulnerability in Xorbits Xoscar by Xorbits
CVE-2026-49950

9.3CRITICAL

Key Information:

Vendor

Xorbitsai

Status
Xoscar
Vendor
CVE Published:
13 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-49950?

The Xorbits Xoscar product version 0.11.2 is susceptible to an unauthenticated deserialization vulnerability that enables remote attackers to execute arbitrary code. This exploitation occurs through the actor-pool TCP channel, where attackers can manipulate the data sent over the SocketChannel.recv() function. By passing unvalidated data to cloudpickle.loads(), an inherent flaw allows executing pickle reduce gadgets before validating the message type, leading to remote code execution within the server process, which typically operates with elevated privileges on GPU nodes.

Affected Version(s)

xoscar 0.1.0 <= 0.11.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-49950 - Proof of Concept

References

https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/x...
https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/x...
https://www.vulncheck.com/advisories/xorbits-xoscar-unaut...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Valentin Lobstein (Chocapikk)
.