CVE-2023-40031: Notepad-Plus-Plus Notepad++

High severity, CVSS 7.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Notepad++ is a free and open-source source code editor. Versions 8.5.6 and prior are vulnerable to heap buffer write overflow in `Utf8_16_Read::convert`. This issue may lead to arbitrary code execution. As of time of publication, no known patches are available in existing versions of Notepad++.

Affected products

• Notepad-Plus-Plus Notepad++: up to and including 8.5.6

Published 2023-08-25. Last modified 2026-06-17.