{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.21.0"
              },
              {
                "fixed": "0.42.2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0c107cb99dc7a456ea4420457289896e7c6e2d0b"
            },
            {
              "fixed": "306d2d94a3b526f43281313321bf784f2d46a7fe"
            },
            {
              "fixed": "439b2200d9e26a4ff414aeb043785df45a78422b"
            }
          ],
          "repo": "https://github.com/docker/mcp-gateway",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-r2xf-7jw5-pjg6"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-88"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55887.json"
  },
  "details": "MCP Gateway allows easy and secure running and deployment of MCP servers. From 0.21.0 until 0.42.2, Docker MCP Gateway YAML-unmarshalled the attacker-controlled io.docker.server.metadata OCI image label into the broad catalog.Server structure for direct docker:// references and catalog snapshot imports in pkg/oci/self_contained.go and pkg/workingset/workingset.go. Runtime-shaping fields including Volumes, User, and ExtraHosts were then appended to the docker run argument vector without an origin allowlist, allowing a malicious image author to request host filesystem or Docker socket mounts and UID 0 execution when a victim selected or pulled the image. This container-creation-time boundary bypass can execute arbitrary code on the host and is not prevented by no-new-privileges because no in-container privilege escalation is required. This issue is fixed in version 0.42.2.",
  "id": "CVE-2026-55887",
  "modified": "2026-09-17T03:30:55.051126765Z",
  "published": "2026-09-15T15:45:36.420Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/docker/mcp-gateway/releases/tag/v0.42.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55887.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/docker/mcp-gateway/security/advisories/GHSA-r2xf-7jw5-pjg6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55887"
    },
    {
      "type": "FIX",
      "url": "https://github.com/docker/mcp-gateway/commit/306d2d94a3b526f43281313321bf784f2d46a7fe"
    },
    {
      "type": "FIX",
      "url": "https://github.com/docker/mcp-gateway/commit/439b2200d9e26a4ff414aeb043785df45a78422b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/docker/mcp-gateway/pull/498"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MCP Gateway: Argument injection via OCI image label YAML in Docker MCP Gateway"
}