What’s Vulnerable › Vulnerabilities

CVE-2026-42214: Improper Control of Generation of Code ('Code Injection') in dail8859/NotepadNext

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-07 · updated 2026-10-26
• Weakness: CWE-94

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.

Affected products

• dail8859 NotepadNext: before 0.14 — fixed in 0.14

How to fix

Upgrade to a fixed version: dail8859 NotepadNext 0.14. Check the vendor advisory for mitigations.

References

• https://github.com/dail8859/NotepadNext/commit/f3ca1b10aca52f05fd7f4f5ebf9b566d6cd95ccc
• https://github.com/dail8859/NotepadNext/releases/tag/v0.14
• https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54g
• https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54g

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