VULNERABILITY INTELLIGENCE

CVE-2026-54758

CVSS score7.8 HIGH
EPSS probability0.19%
CISA KEVNot currently listed
Published2026-08-17
Last modified2026-09-09
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Description

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.

Weakness classification

  • security-advisories@github.com: CWE-121

Primary references