The Decomposer component in multiple Symantec products allows remote attackers to cause a denial of service (infinite loop) via a certain value in the PACK_SIZE field of a RAR archive file header.
http://www.zerodayinitiative.com/advisories/ZDI-07-039.html
http://www.vupen.com/english/advisories/2007/2508
http://www.securityfocus.com/bid/24282
http://securityresponse.symantec.com/avcenter/security/Content/2007.07.11f.html