CVE-2018-14404: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 3.7% chance of exploitation in the next 30 days.

A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEval() function of libxml2 through 2.9.8 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case. Applications processing untrusted XSL format inputs with the use of the libxml2 library may be vulnerable to a denial of service attack due to a crash of the application.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 18.04 only
• Debian Debian Linux: affected versions not specified
• Xmlsoft LIBXML2: up to and including 2.9.8

Published 2018-07-19. Last modified 2026-06-17.