Imlib2 is replacement library from the Enlightenment project for libraries like libXpm.
Julien Danjou reported a pointer arithmetic error and a heap-based buffer overflow within the load() function of the XPM image loader.
A remote attacker could entice a user to process a specially crafted XPM image, possibly resulting in the remote execution of arbitrary code with the privileges of the user running the application, or a Denial of Service.
There is no known workaround at this time.
All Imlib2 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/imlib2-1.4.2-r1"