What is CVE-2026-49950?

CVE-2026-49950 is a critical-severity vulnerability in Xorbitsai Xoscar, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-10-13.

How severe is CVE-2026-49950?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Xorbitsai Xoscar

CVE-2026-49950

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.

Vulnerability class: Insecure Deserialization

Published 2026-10-13 · last modified 2026-10-14.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Xorbitsai Xoscar

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

Frequently asked questions

What is CVE-2026-49950?: CVE-2026-49950 is a critical-severity vulnerability in Xorbitsai Xoscar, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-10-13.
How severe is CVE-2026-49950?: Critical severity. CVSS v3 base score is 9.8 out of 10.