CVE-2016-4052: Canonical Ubuntu Linux

High severity, CVSS 8.1. EPSS: 12.9% chance of exploitation in the next 30 days.

Multiple stack-based buffer overflows in Squid 3.x before 3.5.17 and 4.x before 4.0.9 allow remote HTTP servers to cause a denial of service or execute arbitrary code via crafted Edge Side Includes (ESI) responses.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only; version 16.04 only
• Squid-Cache Squid: version 3.0 only; version 3.1 only; version 3.1.0.1 only; version 3.1.0.2 only; version 3.1.0.3 only; version 3.1.0.4 only; …

Published 2016-04-25. Last modified 2026-06-17.