Newsbeuter is a RSS/Atom feed reader for the text console.
Newsbeuter does not properly escape shell meta-characters in an RSS item with a media enclosure in the podcast playback function of Podbeuter.
A remote attacker, by enticing a user to open a feed with a specially crafted media enclosure, could possibly execute arbitrary shell commands with the privileges of the user running the application.
There is no known workaround at this time.
Gentoo has discontinued support for Newsbeuter and recommends that users unmerge the package:
# emerge --unmerge "net-news/newsbeuter"