CVE-2015-2942: Undefined Security Weakness

MediaWiki before 1.19.24, 1.2x before 1.23.9, and 1.24.x before 1.24.2, when using HHVM, allows remote attackers to cause a denial of service CPU and memory consumption via a large number of nested entity references in an 1 SVG file or 2 XMP metadata in a PDF file, aka a "billion laughs attack," ...