CVE-2016-1000004: Facebook Hhvm

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Insufficient type checks were employed prior to casting input data in SimpleXMLElement_exportNode and simplexml_import_dom. This issue affects HHVM versions prior to 3.9.5, all versions between 3.10.0 and 3.12.3 (inclusive), and all versions between 3.13.0 and 3.14.1 (inclusive).

Affected products

• Facebook Hhvm: before 3.9.5 (fixed in 3.9.5); from 3.10.0, up to and including 3.12.3; from 3.13.0, up to and including 3.14.1

Published 2020-02-19. Last modified 2026-06-17.