{
  "cveId": "CVE-2026-54590",
  "url": "https://patchblox.com/security/cve/CVE-2026-54590",
  "summary": "CVE-2026-54590 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-54590, released July 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "python-asyncssh: AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on...",
  "description": "AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Version 2.23.0 contains an incomplete fix for CVE-2026-45309 in SSHServerConfig._set_tokens that blocks /, , and .. before %u substitution in AuthorizedKeysFile but does not block a leading ~ or ${ENV}, allowing later expansion in _expand_val and Path(filename).expanduser() to escape the intended authorized-keys directory. This issue is fixed in version 2.23.1.",
  "published": "2026-07-08T21:16:49Z",
  "severity": "medium",
  "cvss": 5.9,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
  "epss": 0.00336,
  "epssPercentile": 0.2718,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "python-asyncssh",
      "release": "Debian 14",
      "fixedVersion": "2.24.0-1",
      "fix": "DEBIAN-CVE-2026-54590",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-54590",
      "released": "2026-07-08T21:16:49Z"
    },
    {
      "platform": "linux",
      "product": "python-asyncssh",
      "release": "Fedora 43",
      "fixedVersion": "2.23.1-1.fc43",
      "fix": "FEDORA-2026-574496D9AE",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-574496d9ae",
      "released": "2026-07-11T23:25:59Z"
    },
    {
      "platform": "linux",
      "product": "python3-asyncssh",
      "release": "Fedora 43",
      "fixedVersion": "2.23.1-1.fc43",
      "fix": "FEDORA-2026-574496D9AE",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-574496d9ae",
      "released": "2026-07-11T23:25:59Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}