This update for squid fixes the following issues:
- CVE-2020-15810: Fixed a HTTP Request Smuggling that could have resulted in cache poisoning (bsc#1175664).
- CVE-2019-12523: Disabled urn parsing and parsing of unknown schemes (bsc#1156329).
- CVE-2019-18676: Disabled urn parsing and parsing of unknown schemes (bsc#1156329).