ImageMagick is a collection of tools to read, write and manipulate images in many formats.
ImageMagick fails to do proper bounds checking when handling image files with EXIF information.
An attacker could use an image file with specially-crafted EXIF information to cause arbitrary code execution with the permissions of the user running ImageMagick.
There is no known workaround at this time.
All ImageMagick users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-gfx/imagemagick-6.1.3.2"