As a developer of a Vte terminal for elementary OS, this comes as another reminder that Vte is really bad. Firstly, I was really angry with the fact that it couldn't search for "hello" in the same line. For example, it would only find the first instance of "hello" in a line, and then skip to the next one in a different line.

Now this security issue, it's very dangerous and causes many issues.

Thanks a lot for warning me, I probably will stop using Vte, I've just been recommended TermKit and others, time to check those out!