CVE-2018-6914: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 10.2% chance of exploitation in the next 30 days.

Directory traversal vulnerability in the Dir.mktmpdir method in the tmpdir library in Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1 might allow attackers to create arbitrary directories or files via a .. (dot dot) in the prefix argument.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.10 only
• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 7.4 only; version 7.5 only; version 7.6 only
• Ruby-Lang Ruby: from 2.2.0, before 2.2.10 (fixed in 2.2.10); from 2.3.0, before 2.3.7 (fixed in 2.3.7); from 2.4.0, before 2.4.4 (fixed in 2.4.4); from 2.5.0, before 2.5.1 (fixed in 2.5.1); version 2.6.0 only

Published 2018-04-03. Last modified 2026-06-17.