Gopher problem in Squid
If a Gopher server returned a line that was more than 4096 characters long, this caused a buffer overflow in Squid. The Squid developers' advisory says that this "usually" crashes Squid. The authors neglect to comment on whether the hole can be exploited to inject and execute code although usually, this is the case.
Most 3.x versions of Squid are affected. The developers have provided updated packages that no longer contain the flaw. As a workaround, access to Gopher URLs can also be denied via ACL:
acl Gopher proto Gopher
http_access deny Gopher