CVE-2026-114135

{
  "etk_id": "ETK-2026-2355",
  "cve_id": "CVE-2026-114135",
  "display_id": "CVE-2026-114135",
  "ghsa_id": "GHSA-354v-3q48-cv69",
  "euvd_id": "EUVD-2026-107544",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Missing kernel-execution authorization in Jupyter Server gateway WebSocket",
  "summary": "Jupyter Server gateway deployments using versions 2.0.0 through 2.5.0 may fail to enforce configured kernel-execution permissions on WebSocket connections. An authenticated user denied kernel execution can access an upstream kernel when GatewayClient.url is enabled and a restrictive custom Authorizer is in use, potentially reaching data or credentials available to that kernel.",
  "mitigation": "Upgrade jupyter-server to version 2.6.0 or later. Do not manually register the deprecated jupyter_server.gateway.handlers module, and verify that gateway WebSocket traffic uses the standard authorization path.",
  "vendor": "pip",
  "product": "pip:jupyter-server",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.0.0, < 2.6.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "2.6.0"
      ],
      "package_name": "jupyter-server",
      "purl": "pkg:pypi/jupyter-server"
    }
  ],
  "cwes": [
    862
  ],
  "cvss_score": 8.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 13.982973433333333,
  "t0_at": "2026-10-21T19:58:51.544000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-21T20:49:51.120481+00:00",
      "days": 0.035411764826388886,
      "is_lower_bound": false,
      "measured_at": "2026-10-21T19:58:51.544000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-21T19:58:51.544000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-21T19:58:51.544000+00:00",
      "url": "https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-354v-3q48-cv69"
    }
  }
}