libgssglue exports a GSSAPI interface which calls other random GSSAPI libraries.
libgssglue does not securely use getenv() when loading a library for a setuid application.
A local attacker could gain escalated privileges.
There is no known workaround at this time.
All libgssglue users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-libs/libgssglue-0.4"