mpg123 is a realtime MPEG 1.0/2.0/2.5 audio player for layers 1, 2 and 3.
The vendor reported a signedness error in the store_id3_text() function in id3.c, allowing for out-of-bounds memory access.
A remote attacker could entice a user to open an MPEG-1 Audio Layer 3 (MP3) file containing a specially crafted ID3 tag, possibly resulting in the execution of arbitrary code with the privileges of the user running the application.
There is no known workaround at this time.
All mpg123 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-sound/mpg123-1.7.2"