Standard antivirus software often flags Netcat-based tools as "hacktools" or "Potentially Unwanted Programs" (PUPs) because they can be used to create unauthorized remote shells. If you are using this for legitimate homebrew purposes, you may need to add an exception in your security software.

Assume you are using the GitHub release link.

Never use Netcat GUI v13 to create unauthorized backdoors or exfiltrate data.

In the world of networking tools, version numbers like "v13" are often associated with specific third-party projects or, occasionally, misleading "repacks" found on software hosting sites.