Updated squid packages fix security vulnerability:
Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody (CVE-2021-28116).
Squid is updated to 4.17 that fixes this issue and other bugs.