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.

CVSS 4.0

9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.9% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-25)

CWE

CWE-502

Published

2026-10-13

Modified

2026-10-16

Record from

the NVD, synced 2026-10-19

References

• https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/backends/communication/socket.py#L99-L104
• https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/serialization/core.pyx#L260
• https://www.vulncheck.com/advisories/xorbits-xoscar-unauthenticated-deserialization-rce-via-actor-pool
• https://www.vulncheck.com/blog/xorbits-xoscar-unauth-cloudpickle-rce

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