there's new stable squid version 2.6.13 http://www.squid-cache.org/Versions/v2/2.6/squid-2.6.STABLE13-RELEASENOTES.html http://www.squid-cache.org/Versions/v2/2.6/squid-2.6.STABLE13-RELEASENOTES.html#s18 http://www.squid-cache.org/Versions/v2/2.6/changesets/SQUID_2_6_STABLE13.html
Fixed in cvs.