Joshua Morin, Mikko Varpiola and Jukka Taimisto discovered an assertion error in squid3, a full featured Web Proxy cache, which could lead to a denial of service attack. For the stable distribution , this problem has been fixed in version 3.0.STABLE8-3, which was already included in the lenny release. For the oldstable distribution , this problem has been fixed in version 3.0.PRE5-5+etch1. For the testing distribution and the unstable distribution , this problem has been fixed in version 3.0.STABLE8-3.