bzip2 allows remote attackers to cause a denial of service (hard drive consumption) via a crafted bzip2 file that causes an infinite loop (a.k.a "decompression bomb").
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A749
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10700
http://www.vupen.com/english/advisories/2007/3868
http://www.vupen.com/english/advisories/2007/3525
http://www.us-cert.gov/cas/techalerts/TA07-319A.html
http://www.securityfocus.com/bid/26444
http://www.securityfocus.com/bid/13657
http://www.redhat.com/support/errata/RHSA-2005-474.html
http://www.debian.org/security/2005/dsa-741
http://secunia.com/advisories/27643
http://secunia.com/advisories/27274
http://secunia.com/advisories/19183
http://secunia.com/advisories/15447
http://lists.apple.com/archives/security-announce/2007/Nov/msg00002.html