Squid Proxy Cache Security Update Advisory SQUID-2009:1 – Due to an internal error Squid is vulnerable to a denial of service attack when processing specially crafted requests. Versions 2.7 up through STABLE5, 3.0 up through STABLE12, and 3.1.0.4 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/74632/SQUID-2009-1.txt
Source: https://packetstormsecurity.com/files/74632/Squid-Denial-Of-Service.html