Missing Authentication on /libp2p-http Ingress in Google OSS Agent Mesh (SAM)

{
  "id": "b04db44fb2f13ebb0ce1449351bd4a602a4a22df872d6e8da0b64af9ace249f4",
  "url": "https://osv.dev/vulnerability/CVE-2026-102503",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Missing Authentication on /libp2p-http Ingress in Google OSS Agent Mesh (SAM)",
    "summary": "Missing Authentication for Critical Function (CWE-306) and Missing Authorization (CWE-862) in the /libp2p-http ingress server (StartIngressServer in cmd/sam-node/node.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.2 allow an unauthenticated remote libp2p peer to bypass Biscuit capability policy enforcement and invoke arbitrary registered backend services (including command/stdio-backed MCP servers, A2A, and inference endpoints). While the MCP protocol stream handler enforces WithBiscuitAuth and Authorize checks, the parallel /libp2p-http ingress routes requests directly to backend service handlers without verifying a Biscuit token or mesh enrollment. Users should upgrade to version 0.1.0-alpha.3 or later.",
    "evidence": "osv:CVE-2026-102503",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-102503",
      "aliases": [
        "CVE-2026-102503",
        "GHSA-r6hp-67wp-c7jx"
      ],
      "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/google/agentmesh",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ffc3e6072383ea6e9cf3fbadc7cf473db448b364"
                },
                {
                  "fixed": "866ff9bfd056f8f76ba22c9b45394aef6ce148a1"
                },
                {
                  "fixed": "433bc99d2a2c10071167bf22acc2c930a12e64e1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.1.0-alpha.1"
                      },
                      {
                        "fixed": "0.1.0-alpha.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "433bc99d2a2c10071167bf22acc2c930a12e64e1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "866ff9bfd056f8f76ba22c9b45394aef6ce148a1"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.1.0-alpha.3"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102503.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.811194553Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102503.json",
        "https://github.com/google/sam/releases/tag/v0.1.0-alpha.3",
        "https://github.com/google/sam/security/advisories/GHSA-r6hp-67wp-c7jx",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-102503",
        "https://github.com/google/sam/commit/433bc99d2a2c10071167bf22acc2c930a12e64e1",
        "https://github.com/google/agentmesh/security/advisories/GHSA-r6hp-67wp-c7jx"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-306",
          "CWE-862"
        ],
        "cna_assigner": "Google",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102503.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-102503",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488263,
  "published_at": "2026-10-19T02:20:35.753+00:00"
}