CVE-2016-4054: Canonical Ubuntu Linux

High severity, CVSS 8.1. EPSS: 77.6% chance of exploitation in the next 30 days.

Buffer overflow in Squid 3.x before 3.5.17 and 4.x before 4.0.9 allows remote attackers to 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
• Oracle Linux: version 6 only; version 7 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.