CVE-2019-18860: Canonical Ubuntu Linux

Medium severity, CVSS 6.1. EPSS: 5.5% chance of exploitation in the next 30 days.

Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter to cachemgr.cgi.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 19.10 only; version 20.04 only
• Debian Debian Linux: version 9.0 only; version 10.0 only
• Opensuse Leap: version 15.1 only
• Squid-Cache Squid: before 4.9 (fixed in 4.9)

Published 2020-03-20. Last modified 2026-06-17.