CVE-2019-18679: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 41% chance of exploitation in the next 30 days.

An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 19.04 only; version 19.10 only
• Debian Debian Linux: version 8.0 only
• Fedoraproject Fedora: version 30 only; version 31 only
• Squid-Cache Squid: from 2.0, up to and including 2.7; from 3.0, up to and including 3.5.28; from 4.0, up to and including 4.8; version 2.7 only

Published 2019-11-26. Last modified 2026-06-17.