CVE-2026-42214
HighSummary
Notepad Next prior to version 0.14 had a detectLanguageFromExtension() function that interpolated a file's extension without sanitization, allowing attackers to inject Lua code. When such a file is opened in NotepadNext, the malicious code is executed automatically.
Risk Assessment
An attacker could exploit this vulnerability to execute arbitrary commands on the victim's system, posing a serious threat to data and system security.
Recommendation
It is recommended to update Notepad Next to version 0.14 or later to mitigate this vulnerability.
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Original NVD description (English source)
Notepad Next is a cross-platform, reimplementation of Notepad++. Prior to version 0.14, NotepadNext's detectLanguageFromExtension() function interpolates a file's extension directly into a Lua script without sanitization. An attacker can craft a filename whose extension contains Lua code, which executes automatically when the victim opens the file in NotepadNext. Because luaL_openlibs() is called unconditionally, the full os, io, and package libraries are available to the injected code, enabling arbitrary command execution. This issue has been patched in version 0.14.