Vulnerability · Published Oct 13, 2026 · Assigned by VulnCheck

CVE-2026-49950Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool

Critical 9.8

In plain English

A critical-severity unsafe deserialization in xoscar from xorbitsai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 58% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.9%top 41.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
xorbitsai	xoscar	0.1.0 – through 0.11.2

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Vulnerable Sink
Unauthenticated Entry Point
VulnCheck Advisory: Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool third-party-advisory
VulnCheck Blog: Xorbits Xoscar: Unauthenticated RCE via Cloudpickle Deserialization in the Actor Pool exploit, technical-description