Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dail8859 | Notepad Next | < 0.14 |
Related Weaknesses (CWE)
References
- https://github.com/dail8859/NotepadNext/commit/f3ca1b10aca52f05fd7f4f5ebf9b566d6Patch
- https://github.com/dail8859/NotepadNext/releases/tag/v0.14Release Notes
- https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54gExploitMitigationVendor Advisory
- https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54gExploitMitigationVendor Advisory
FAQ
What is CVE-2026-42214?
CVE-2026-42214 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...
How severe is CVE-2026-42214?
CVE-2026-42214 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42214?
Check the references section above for vendor advisories and patch information. Affected products include: Dail8859 Notepad Next.