{"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":0.08049,"ingestedAt":"2026-09-09T21:22:45.535Z","slug":"CVE-2026-54758","body":"## Overview\n\nNotepad++ 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}