Video player based on MPlayer/mplayer2.
mpv uses untrusted input within format strings.
A remote attacker could entice a user to open a specially crafted m3u playlist file using mpv, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.
There is no known workaround at this time.
All mpv users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-video/mpv-0.33.1"