dns_internal.cc in Squid 3.1.6, when IPv6 DNS resolution is not enabled,
accesses an invalid socket during an IPv4 TCP DNS query, which allows remote
attackers to cause a denial of service (assertion failure and daemon exit)
via vectors that trigger an IPv4 DNS response with the TC bit set.
Accoding to http://marc.info/?l=squid-users&m=128263555724981&w=2 this was fixed in squid 3.1.7. Moving to [glsa] with the other squid bugs.
This issue was resolved and addressed in
GLSA 201110-24 at http://security.gentoo.org/glsa/glsa-201110-24.xml
by GLSA coordinator Tim Sammut (underling).