Vulnerability details
CVE-2026-49950
xorbitsai xoscar
Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool
CVSS 4.0
9.3Critical
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| xorbitsai | xoscar | 0.1.0 ≤ v ≤ 0.11.2 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/serialization/core.pyx#L260
- https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/backends/communication/socket.py#L99-L104
- https://www.vulncheck.com/advisories/xorbits-xoscar-unauthenticated-deserialization-rce-via-actor-pool third-party-advisory
- https://www.vulncheck.com/blog/xorbits-xoscar-unauth-cloudpickle-rce exploittechnical-description
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Details
- Published
- 2026-10-13
- Last updated
- 2026-10-16
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 39 · Medium
Exploit prediction (EPSS)
0.85%
Probability of exploitation in 30 days
58.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-502Deserialization of Untrusted Data