opera -- URL parsing heap overflow vulnerability

iDefense Labs reports:

Remote exploitation of a heap overflow vulnerability
within version 9 of Opera Software’s Opera Web browser
could allow an attacker to execute arbitrary code on the
affected host.
A flaw exists within Opera when parsing a tag that
contains a URL. A heap buffer with a constant size of 256
bytes is allocated to store the URL, and the tag’s URL is
copied into this buffer without sufficient bounds checking
of its length.