CVE-2019-19246: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 2.9% chance of exploitation in the next 30 days.

Oniguruma through 6.9.3, as used in PHP 7.3.x and other products, has a heap-based buffer over-read in str_lower_case_match in regexec.c.

Affected products

• Canonical Ubuntu Linux: version 14.04 only
• Debian Debian Linux: version 8.0 only
• Fedoraproject Fedora: version 31 only
• Oniguruma Project Oniguruma: up to and including 6.9.3
• PHP PHP: from 7.3.0, before 7.3.10 (fixed in 7.3.10)

Published 2019-11-25. Last modified 2026-06-17.