Google security engineers reported 24 of the 25 vulnerabilities to Adobe, most likely to harden Chrome against hackers' attacks at the contest.

When Google announced Pwnium 2 in August, it said it would set aside as much as $2 million in prize money, to be paid out in increments of $60,000, $50,000 and $40,000 to researchers able to exploit bugs in Chrome, in Chrome and other software, or in non-Google code.

The continued abruptness of Flash updates left a sour taste in Storms' mouth.

"These half-policies and half-practices cause confusion," Storms argued. "They're disjointed. When [the Flash Player] update appeared today, I thought, 'It must be a zero-day' because there was no warning."

Adobe said that it was not aware of any in-the-wild exploits now leveraging the vulnerabilities patched today.