OpenJPEG is an open-source JPEG 2000 library.
An error in jp2.c of OpenJPEG could allow an out-of-bounds write error.
A remote attacker could entice a user to open a specially crafted JPEG file, possibly resulting in execution of arbitrary code or a Denial of Service condition.
There is no known workaround at this time.
All OpenJPEG users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/openjpeg-1.5.0"