CVE-2019-9021: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 10.1% 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 heap-based buffer over-read in PHAR reading functions in the PHAR extension may allow an attacker to read allocated or unallocated memory past the actual data when trying to parse the file name, a different vulnerability than CVE-2018-20783. This is related to phar_detect_phar_fname_ext in ext/phar/phar.c.

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.