CVE-2026-104380

{
  "etk_id": "ETK-2026-726",
  "cve_id": "CVE-2026-104380",
  "display_id": "CVE-2026-104380",
  "ghsa_id": "GHSA-cmh9-2wr3-4x64",
  "euvd_id": "EUVD-2026-92915",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Missing Origin validation for WebSocket handshakes in Punk",
  "summary": "Punk 0.48 through 0.54 handles HTTP/2 and HTTP/3 WebSocket setup requests as GET requests without applying Origin validation. A hostile website can cause a visitor's browser to attempt cross-origin WebSocket handshakes to GET endpoints and observe whether those endpoints respond successfully; the target must be reachable over HTTP/2 or HTTP/3.",
  "mitigation": "Upgrade Punk to version 0.55 or later. Until upgrading, disable HTTP/2 and HTTP/3 where practical or limit access to affected services from untrusted origins.",
  "vendor": null,
  "product": "Punk",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0.48, < 0.55"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "0.55"
      ],
      "package_name": "Punk",
      "purl": null
    }
  ],
  "cwes": [
    1385
  ],
  "cvss_score": 5.3,
  "cvss_src": "nvd",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
  "epss_score": 0.0016,
  "epss_percentile": 0.0514,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 19.979237316666666,
  "t0_at": "2026-10-06T01:13:14.558000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-06T01:13:14.558000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T01:13:14.558000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-104380"
    }
  }
}