The flaw, which Danish bug tracking vendor Secunia rated as "
highly critical," the second-highest ranking in its five-step scoring system, can be exploited by attackers to corrupt memory, crash Opera and theoretically execute attack code. According to the researcher who posted proof-of-concept attack code on the Web last week, the bug affects Opera 10, including the newest version,
Opera 10.50, which shipped last week.
Opera contested Secunia's initial report of the vulnerability, claiming that the bug is not a
security problem because attackers would be able to only crash the browser, not gain control of a PC. However, after prompting from Secunia and further investigation, Opera conceded that the flaw might be exploitable.