CVE-2018-6797: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 6.5% chance of exploitation in the next 30 days.

An issue was discovered in Perl 5.18 through 5.26. A crafted regular expression can cause a heap-based buffer overflow, with control over the bytes written.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 17.10 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Perl Perl: from 5.18, up to and including 5.26
• Red Hat Enterprise Linux Server: version 7.0 only; version 7.3 only; version 7.4 only; version 7.5 only; version 7.6 only
• Red Hat Enterprise Linux Workstation: version 6.0 only; version 7.0 only

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