Squid is a multi-protocol proxy server.
The Wikimedia Foundation reported a memory leak vulnerability when performing cache updates.
A remote attacker could perform numerous specially crafted requests to the vulnerable server, resulting in a Denial of Service.
There is no known workaround at this time.
All Squid users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-proxy/squid-2.6.17"