CVE-2026-42214

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0002

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-94 CWE-94

Affected Products

Vendor	Product	Versions
dail8859	notepad_next	< 0.14

References

Advisories & Patches

https://github.com/dail8859/NotepadNext/commit/f3ca1b10aca52f05fd7f4f5ebf9b566d6cd95ccc https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54g https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54g

Exploits

https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54g https://github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54g

Other References

https://github.com/dail8859/NotepadNext/releases/tag/v0.14

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-42214? +

CVE-2026-42214 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0002, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42214? +

CVE-2026-42214 affects products from dail8859, specifically: notepad_next. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42214? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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