CVE-2017-9049: Xmlsoft LIBXML2

High severity, CVSS 7.5. EPSS: 4.6% chance of exploitation in the next 30 days.

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictComputeFastKey function in dict.c. This vulnerability causes programs that use libxml2, such as PHP, to crash. This vulnerability exists because of an incomplete fix for libxml2 Bug 759398.

Affected products

• Xmlsoft LIBXML2: version 2.9.4 only

Published 2017-05-18. Last modified 2026-06-17.