GIMP is the GNU Image Manipulation Program. XCF is the native image file format used by GIMP.
Henning Makholm discovered that the "xcf_load_vector()" function is vulnerable to a buffer overflow when loading a XCF file with a large "num_axes" value.
An attacker could exploit this issue to execute arbitrary code by enticing a user to open a specially crafted XCF file.
There is no known workaround at this time.
All GIMP users should update to the latest stable version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-gfx/gimp-2.2.12"