For the stable distribution (woody) this problem has been fixed in version 2.4.6-2woody8.
For the unstable distribution (sid) this problem has been fixed in version 2.5.9-7.
CAN-2005-1345
It is recommended that you upgrade your squid packages:
CIAC would like to thank Debian for this information.
http://www.debian.org/security/2005/dsa-721
Additional link: Red Hat HRSA-2005:415-16