Stack-based buffer overflow in Microsoft HTML Help Workshop 4.74.8702.0, and possibly earlier versions, and as included in the Microsoft HTML Help 1.4 SDK, allows context-dependent attackers to execute arbitrary code via a .hhp file with a long Contents file field.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24481
http://www.vupen.com/english/advisories/2006/0446
http://www.kb.cert.org/vuls/id/124460
http://users.pandora.be/bratax/advisories/b008.html