{
  "cveId": "CVE-2026-104851",
  "url": "https://patchblox.com/security/cve/CVE-2026-104851",
  "summary": "CVE-2026-104851 is fixed in 2 products on 1 platform, first by OPENSUSE-SU-2026:22028-1, released October 6, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "fsspec: fsspec is a specification and Python implementation framework for filesystem interfaces",
  "description": "fsspec is a specification and Python implementation framework for filesystem interfaces. From 0.9.0 until 2026.6.0, fsspec.implementations.reference.ReferenceFileSystem evaluates fields from Kerchunk reference JSON documents through unrestricted jinja2.Template(...).render(...) calls in _process_references1._render_jinja, _process_templates, and _process_gen in fsspec/implementations/reference.py. A document supplied inline or fetched from an attacker-controlled URL can provide template expressions that execute Python code when the reference filesystem is opened, including through consumers such as xarray, before referenced data is read. The _process_gen path is reached whenever a document includes a gen array, while the other paths depend on template-related options and values. This issue is fixed in version 2026.6.0.",
  "published": "2026-10-02T17:17:03Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss": 0.00475,
  "epssPercentile": 0.41318,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "fsspec",
      "release": "Debian 14",
      "fixedVersion": "2026.9.0-1",
      "fix": "DEBIAN-CVE-2026-104851",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-104851",
      "released": "2026-10-13T23:28:43Z"
    },
    {
      "platform": "linux",
      "product": "python-fsspec",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "2024.3.1-bp160.2.1",
      "fix": "OPENSUSE-SU-2026:22028-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22028-1",
      "released": "2026-10-06T10:57:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T07:50:38Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}