by Kastro
Paper/Archive/CVE-2026-49950

CVE-2026-49950

xorbitsai xoscar — Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool

EPSS 0.9%CVSS 9.8
critical.is priorityof 100
41
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 58.1.581 × 2011.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
xoscar0.1.0 – 0.11.2–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)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
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/serialization/core.pyx#L260refgithub.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/backends/communication/socket.py#L99-L104writeupvulncheck.com/advisories/xorbits-xoscar-unauthenticated-deserialization-rce-via-actor-poolexploitvulncheck.com/blog/xorbits-xoscar-unauth-cloudpickle-rce