CVE-2019-9023: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 9.3% chance of exploitation in the next 30 days.

An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. A number of heap-based buffer over-read instances are present in mbstring regular expression functions when supplied with invalid multibyte data. These occur in ext/mbstring/oniguruma/regcomp.c, ext/mbstring/oniguruma/regexec.c, ext/mbstring/oniguruma/regparse.c, ext/mbstring/oniguruma/enc/unicode.c, and ext/mbstring/oniguruma/src/utf32_be.c when a multibyte regular expression pattern contains invalid multibyte sequences.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only
• Debian Debian Linux: version 9.0 only
• Netapp Storage Automation Store: affected versions not specified
• Opensuse Leap: version 42.3 only
• PHP PHP: before 5.6.40 (fixed in 5.6.40); from 7.0.0, before 7.1.26 (fixed in 7.1.26); from 7.2.0, before 7.2.14 (fixed in 7.2.14); from 7.3.0, before 7.3.1 (fixed in 7.3.1)

Published 2019-02-22. Last modified 2026-06-17.