CVE-2014-3660: Apple Mac OS X

Medium severity, CVSS 5.0. EPSS: 4% chance of exploitation in the next 30 days.

parser.c in libxml2 before 2.9.2 does not properly prevent entity expansion even when entity substitution has been disabled, which allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted XML document containing a large number of nested entity references, a variant of the "billion laughs" attack.

Affected products

• Apple Mac OS X: up to and including 10.10.4
• Canonical Ubuntu Linux: version 10.04 only; version 12.04 only; version 14.04 only
• Debian Debian Linux: version 7.0 only
• Red Hat Enterprise Linux: version 5.0 only
• Xmlsoft LIBXML2: up to and including 2.9.1; version 2.0.0 only; version 2.1.0 only; version 2.1.1 only; version 2.2.0 only; version 2.2.1 only; …

Published 2014-11-04. Last modified 2026-06-17.