CVE-2015-5312: Apple iPhone OS

High severity, CVSS 7.1. EPSS: 4.5% chance of exploitation in the next 30 days.

The xmlStringLenDecodeEntities function in parser.c in libxml2 before 2.9.3 does not properly prevent entity expansion, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted XML data, a different vulnerability than CVE-2014-3660.

Affected products

• Apple iPhone OS: up to and including 9.2.1
• Apple Mac OS X: up to and including 10.11.3
• Apple tvOS: up to and including 9.1
• Apple watchOS: up to and including 2.1
• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.04 only; version 15.10 only
• Debian Debian Linux: version 7.0 only; version 8.0 only
• HP Icewall Federation Agent: version 3.0 only
• HP Icewall File Manager: version 3.0 only
• Red Hat Enterprise Linux Desktop: version 6.0 only
• Red Hat Enterprise Linux Hpc Node: version 6.0 only
• Red Hat Enterprise Linux Server: version 6.0 only
• Red Hat Enterprise Linux Workstation: version 6.0 only
• Xmlsoft LIBXML2: up to and including 2.9.2

Published 2015-12-15. Last modified 2026-06-17.