Description
Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the WinGup decompress function joins untrusted ZIP entry names to unzipDestTo without canonical containment validation, allowing an entry such as ../mimeTools/mimeTools.dll to overwrite a DLL in a sibling plugin directory and execute attacker-controlled code when Notepad++ next loads that plugin. This issue is fixed in version 8.9.7.
References5
- github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.…
- github.com/notepad-plus-plus/notepad-plus-plus/security/advisor…
- github.com/notepad-plus-plus/wingup/commit/7670296a5c7fdec624e0…
- github.com/notepad-plus-plus/wingup/pull/106
- github.com/notepad-plus-plus/notepad-plus-plus/security/advisor…
Metrics
- CVSS 3.1
-
8.1
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H - EPSS — exploit probability
- 1% percentile: 44 · as of 11 November 2026
- CWE
- CWE-22
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.