CVE-2018-6798: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 3.9% chance of exploitation in the next 30 days.

An issue was discovered in Perl 5.22 through 5.26. Matching a crafted locale dependent regular expression can cause a heap-based buffer over-read and potentially information disclosure.

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
• Perl Perl: from 5.22, up to and including 5.26
• Red Hat Enterprise Linux Server: version 6.0 only; version 7.0 only; version 7.3 only; version 7.4 only; version 7.5 only
• Red Hat Enterprise Linux Workstation: version 6.0 only; version 7.0 only

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