A weakness has been discovered in squid, a caching proxy server. The flaw was introduced upstream in response to CVE-2007-6239, and announced by Debian in DSA-1482-1. The flaw involves an over-aggressive bounds check on an array resize, and could be exploited by an authorized client to induce a denial of service condition against squid.
For the stable distribution (etch), these problems have been fixed in version 2.6.5-6etch2.
We recommend that you upgrade your squid packages.