The YouDao plugin for StarDict, as used in stardict 3.0.7+git20220909+dfsg-6 in Debian trixie and elsewhere, sends an X11 selection to the dict.youdao.com and dict.cn servers via cleartext HTTP.
https://www.openwall.com/lists/oss-security/2025/08/04/1
https://stardict-4.sourceforge.net/index_en.php
https://packages.debian.org/trixie/stardict-gtk
https://packages.debian.org/trixie/stardict