Squid security advisory SQUID-2007:2 was published recently:
http://www.squid-cache.org/Advisories/SQUID-20072.txt
Problem Description:
Due to incorrect bounds checking Squid is vulnerable to a denial of service check during some cache update reply processing.
Severity:
This problem allows any client trusted to use the service to perform a denial of service attack on the Squid service.