CVE-2026-49950CWE-502insecure-deserialization

CVE-2026-49950

Critical · published October 14, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
49.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00631 · 49.6th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-10-14T01:17Z
References (4)
https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/backends/communication/socket.py#L99-L104 · [email protected]https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/serialization/core.pyx#L260 · [email protected]https://www.vulncheck.com/advisories/xorbits-xoscar-unauthenticated-deserialization-rce-via-actor-pool · [email protected]https://www.vulncheck.com/blog/xorbits-xoscar-unauth-cloudpickle-rce · [email protected]
EPSS history
Timeline
  • 15 OCT 03:32Z
    EPSS moved — → 1%
    epss
  • 13 OCT 20:20Z
    Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool
    cvelistv5
  • 13 OCT 20:20Z
    Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool
    cvelistv5