RCE in Dail8859 Notepad Next
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (18.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Dail8859 Notepad Next
- Dail8859 Notepadnext — versions < 0.14
Weakness classification (CWE)
References
- github.com/dail8859/NotepadNext/security/advisories/GHSA-m5fq-c9x5-w54g (Exploit, Mitigation, Vendor Advisory)
- github.com/dail8859/NotepadNext/commit/f3ca1b10aca52f05fd7f4f5ebf9b566d6cd95ccc (Patch)
- github.com/dail8859/NotepadNext/releases/tag/v0.14 (Release Notes)
Frequently asked questions
- What is CVE-2026-42214?
- CVE-2026-42214 is a high-severity vulnerability in Dail8859 Notepad Next, classified under Code Injection. CVSS score: 7.8/10. Published 2026-05-07.
- How severe is CVE-2026-42214?
- High severity. CVSS v3 base score is 7.8 out of 10.