Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDATA_FULL_CMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded NUL-terminated wchar_t* instead of enforcing COPYDATASTRUCT.cbData. This vulnerability is fixed in 8.9.6.1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Notepad Plus Plus | — | Upgrade NotepadPlusPlus to the latest version | Jun 26, 2026 | Jun 26, 2026 |
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