CVE-2026-108859

{
  "etk_id": "ETK-2026-1249",
  "cve_id": "CVE-2026-108859",
  "display_id": "CVE-2026-108859",
  "ghsa_id": "GHSA-c673-ppxx-9wvj",
  "euvd_id": "EUVD-2026-97010",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unauthenticated memory-exhaustion denial of service in mcp-go",
  "summary": "mcp-go versions through 1.2.1 are affected in StreamableHTTPServer request handling. A remote unauthenticated client can cause excessive memory consumption and potentially terminate the service by submitting oversized or highly concurrent POST requests to a reachable server.",
  "mitigation": "Enforce POST body-size and concurrent-request limits at a reverse proxy or other upstream gateway before requests reach StreamableHTTPServer. Restrict public access to affected endpoints until an updated release is identified and deployed.",
  "vendor": "mark3labs",
  "product": "mcp-go",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, <= 1.2.1"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "mcp-go",
      "purl": null
    }
  ],
  "cwes": [
    770
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0055,
  "epss_percentile": 0.4467,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 8.951609733333333,
  "t0_at": "2026-10-11T13:26:06.450000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-11T13:26:06.450000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-11T13:26:06.450000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-108859"
    }
  }
}