FedML-AI FedML gRPC server grpc_server.py sendMessage deserialization

{
  "id": "334a505498cd8bf484c5a74c4c948ad422d90cf397c2e76ef3c23de836454842",
  "url": "https://osv.dev/vulnerability/CVE-2026-5536",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FedML-AI FedML gRPC server grpc_server.py sendMessage deserialization",
    "summary": "A weakness has been identified in FedML-AI FedML up to 0.8.9. Affected is the function sendMessage of the file grpc_server.py of the component gRPC server. Executing a manipulation can lead to deserialization. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.",
    "evidence": "osv:CVE-2026-5536",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-5536",
      "aliases": [
        "CVE-2026-5536"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/fedml-ai/fedml",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "f352cfb5a59f63d4f85ede43682962a5f9ea4a6a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:tensoropera:fedml:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.8.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.8.9",
            "v0.8.8",
            "v0.8.7",
            "v0.8.4",
            "v0.8.3",
            "v0.8.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5536.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.636566793Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5536.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-5536",
        "https://vuldb.com/submit/782201",
        "https://vuldb.com/vuln/355289",
        "https://github.com/AnalogyC0de/public_exp/issues/26",
        "https://vuldb.com/vuln/355289/cti"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20",
          "CWE-502"
        ],
        "cna_assigner": "VulDB",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0.8.0"
                  },
                  {
                    "last_affected": "0.8.0"
                  },
                  {
                    "introduced": "0.8.1"
                  },
                  {
                    "last_affected": "0.8.1"
                  },
                  {
                    "introduced": "0.8.2"
                  },
                  {
                    "last_affected": "0.8.2"
                  },
                  {
                    "introduced": "0.8.3"
                  },
                  {
                    "last_affected": "0.8.3"
                  },
                  {
                    "introduced": "0.8.4"
                  },
                  {
                    "last_affected": "0.8.4"
                  },
                  {
                    "introduced": "0.8.5"
                  },
                  {
                    "last_affected": "0.8.5"
                  },
                  {
                    "introduced": "0.8.6"
                  },
                  {
                    "last_affected": "0.8.6"
                  },
                  {
                    "introduced": "0.8.7"
                  },
                  {
                    "last_affected": "0.8.7"
                  },
                  {
                    "introduced": "0.8.8"
                  },
                  {
                    "last_affected": "0.8.8"
                  },
                  {
                    "introduced": "0.8.9"
                  },
                  {
                    "last_affected": "0.8.9"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "0.8.9"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5536.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-5536",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496744,
  "published_at": "2026-04-05T02:45:12.841+00:00"
}