Exiv2 is a C++ library and a command line utility to manage image metadata.
Exiv2 has a buffer overflow in the RiffVideo::infoTagsHandler function in riffvideo.cpp.
A remote attacker could possibly cause a Denial of Service condition via a specially crafted AVI file with IKEY INFO tag.
There is no known workaround at this time.
All Exiv2 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-gfx/exiv2-0.24-r1"