Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool

{
  "id": "bb2bfb018984bc4d6b495769dce0f1fc32ad4f2b9f63e6b67398eaa4f68cbed7",
  "url": "https://osv.dev/vulnerability/CVE-2026-49950",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Xorbits Xoscar 0.11.2 Unauthenticated Deserialization RCE via Actor Pool",
    "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.",
    "evidence": "osv:CVE-2026-49950",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-49950",
      "aliases": [
        "CVE-2026-49950"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/xorbitsai/xoscar",
              "type": "GIT",
              "events": [
                {
                  "introduced": "064891423f0f061d894008797fc1169227cca0b7"
                },
                {
                  "last_affected": "ef2af816d34f3493bab9b5736fa612f78c7ef1a8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.1.0"
                      },
                      {
                        "last_affected": "0.11.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.11.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.11.2",
            "v0.11.1",
            "v0.11.0",
            "v0.10.1",
            "v0.10.0",
            "v0.9.12",
            "v0.9.11",
            "v0.9.10",
            "v0.9.9",
            "v0.9.8",
            "v0.9.7",
            "v0.9.6",
            "v0.9.5",
            "v0.9.4",
            "v0.9.3",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.1",
            "v0.8.0",
            "v0.8.0.rc1",
            "v0.7.17",
            "v0.7.16",
            "v0.7.15",
            "v0.7.14",
            "v0.7.13",
            "v0.7.12",
            "v0.7.11",
            "v0.7.10",
            "v0.7.9",
            "v0.7.8",
            "v0.7.7",
            "v0.7.6",
            "v0.7.5",
            "v0.7.4",
            "0.7.4",
            "v0.7.3",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.7.0.rc1",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.0",
            "v0.4.6",
            "v0.4.5",
            "v0.4.4",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.1",
            "v0.2.0",
            "v0.1.4",
            "v0.1.3",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49950.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.969614798Z",
      "provider": "osv",
      "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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49950.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-49950",
        "https://www.vulncheck.com/advisories/xorbits-xoscar-unauthenticated-deserialization-rce-via-actor-pool",
        "https://github.com/xorbitsai/xoscar",
        "https://www.vulncheck.com/blog/xorbits-xoscar-unauth-cloudpickle-rce"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-502"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49950.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-49950",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517225,
  "published_at": "2026-10-13T20:20:36.251+00:00"
}