X.Org X11 libXcursor runtime library.
It was discovered that libXcursor is prone to several heap overflows when parsing malicious files.
A remote attacker, by enticing a user to process a specially crafted cursor file, could possibly execute arbitrary code with the privileges of the process or cause a Denial of Service condition.
There is no known workaround at this time.
All LibXcursor users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-libs/libXcursor-1.1.15"