cve/2023/CVE-2023-40031.md

### [CVE-2023-40031](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-40031)
![](https://img.shields.io/static/v1?label=Product&message=notepad-plus-plus&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%3D%208.5.6%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-120%3A%20Buffer%20Copy%20without%20Checking%20Size%20of%20Input%20('Classic%20Buffer%20Overflow')&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-122%3A%20Heap-based%20Buffer%20Overflow&color=brighgreen)

### Description

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++.

### POC

#### Reference
- https://securitylab.github.com/advisories/GHSL-2023-092_Notepad__/

#### Github
- https://github.com/123papapro/123papapro
- https://github.com/nomi-sec/PoC-in-GitHub
- https://github.com/webraybtl/CVE-2023-40031