Squid is susceptible to a class of attacks known as "HTTP Request Smuggling." These attacks involve sending malformed HTTP requests that cause Squid and an upstream HTTP agent (origin server or another proxy) to disagree on the boundary between HTTP requests on a persistent connection. http://www3.br.squid-cache.org/Advisories/SQUID-2005_4.txt
This issue should also affect RHEL2.1 and RHEL3
*** This bug has been marked as a duplicate of 146161 ***