CVE-2026-42214

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.

• CWE-94

• https://github.com/dail8859/NotepadNext/commit/f3ca1b10aca52f05fd7f4f5ebf9b566d6cd95cccPatch
• https://github.com/dail8859/NotepadNext/releases/tag/v0.14Release Notes
• https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54gExploit, Mitigation, Vendor Advisory
• https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54gExploit, Mitigation, Vendor Advisory

Published

May 7, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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