{
  "cveId": "CVE-2026-54758",
  "url": "https://patchblox.com/security/cve/CVE-2026-54758",
  "summary": "CVE-2026-54758 is fixed in Notepad\u002B\u002B on 1 platform by Notepad\u002B\u002B 8.9.7 (version 8.9.7), released July 14, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Notepad\u002B\u002B: Stack Buffer Overflow in expandNppEnvironmentStrs",
  "description": "Notepad\u002B\u002B is a free and open-source source code editor. Prior to 8.9.7, the expandNppEnvironmentStrs function in PowerEditor/src/WinControls/StaticDialog/RunDlg/RunDlg.cpp copies a Notepad\u002B\u002B variable name between $( and ) into the fixed-size wchar_t str[MAX_PATH] stack buffer without bounding the m loop index, allowing a name of 260 or more characters to corrupt adjacent stack data, terminate the process through __report_gsfailure, and potentially execute code. This issue is fixed in version 8.9.7.",
  "published": "2026-08-17T20:16:44Z",
  "severity": "",
  "cvss": 7.8,
  "cwe": "CWE-121: Stack-based Buffer Overflow",
  "epss": 0.00194,
  "epssPercentile": 0.09165,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2026-54758",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Notepad\u002B\u002B",
      "fixedVersion": "8.9.7",
      "fix": "Notepad\u002B\u002B 8.9.7",
      "url": "https://patchblox.com/security/fix/windows-app/notepad-.notepad-8.9.7",
      "released": "2026-07-14T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}