Unspecified vulnerability in libclamav/phishcheck.c in ClamAV before 0.90.3 and 0.91 before 0.91rc1, when running on Solaris, allows remote attackers to cause a denial of service (hang) via unknown vectors related to the isURL function and regular expressions.
http://secunia.com/advisories/25525
http://lurker.clamav.net/message/20070530.224918.5c64abc4.en.html