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USN-5491-1: Squid vulnerability

22 June 2022

Squid could be made to crash if it received specially crafted network traffic.



  • squid - Web proxy cache server
  • squid3 - Web proxy cache server


Joshua Rogers discovered that Squid incorrectly handled the Gopher
protocol. A remote attacker could possibly use this issue to cause Squid to
crash, resulting in a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 22.04
Ubuntu 21.10
Ubuntu 20.04
Ubuntu 18.04

In general, a standard system update will make all the necessary changes.