Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPM_SAVESESSION handler in PowerEditor/src/NppBigSwitch.cpp converts lParam to a sessionInfo pointer and dereferences its nbFile, files, and sessionFilePathName members without checking for null. A process running at the same or a higher Windows integrity level on the same desktop can send NPPM_SAVESESSION with a null lParam, immediately terminating Notepad++ and causing denial of service and loss of unsaved documents. This issue is fixed in version 8.9.8.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Notepad Plus Plus | — | Upgrade NotepadPlusPlus to the latest version | Sep 23, 2026 | Sep 22, 2026 |
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