CVE-2026-49950 json
Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool
published 2026-10-13 26 d ago modified 2026-10-16 23 d ago also EUVD-2026-100500
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 58%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 25 d ago
Exploit prediction
0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- vulncheck.com https://www.vulncheck.com/blog/xorbits-xoscar-unauth-cloudpickle-rce referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- xorbitsai xoscar
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
vulncheck.com
/blog/xorbits-xoscar-unauth-cloudpickle-rce
exploit, technical-description
- github.com /xorbitsai/xoscar/blob/v0.11.2/python/xoscar/serialization/core.pyx#L260
- github.com /xorbitsai/xoscar/blob/v0.11.2/python/xoscar/backends/communication/socket.py#L99-L104
-
vulncheck.com
/advisories/xorbits-xoscar-unauthenticated-deserialization-rce-via-actor-pool
third-party-advisory
Sources
- CVE List CVE-2026-49950
- NVD CVE-2026-49950
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