---
id: CVE-2026-54758
title: Notepad++ is a free and open-source source code editor
summary: >-
  Notepad++ 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++
  variable name between $( and ) into the fixed-…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
  - CWE-787
published: '2026-08-17'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:11:25.743'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54758'
references:
  - url: >-
      https://github.com/notepad-plus-plus/notepad-plus-plus/commit/0a9527e9f7140a2323e25d14e362b46ee0efc3db
    label: security-advisories@github.com
  - url: 'https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7'
    label: security-advisories@github.com
  - url: >-
      https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-gv94-327x-2gc5
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00194
epssPercentile: 0.08101
ingestedAt: '2026-09-09T21:22:45.535Z'
---

## Overview

Notepad++ 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++ 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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.