Safari Stack Overflow in JavaScriptCore.dll
Unhandled exception at 0x5c778947 in Safari.exe: 0xC00000FD: Stack overflow.
Meh. Enough said. The exploit can be found here.
The error seems to occur when the src property in the iframes is set to mailto:DoS. Don't ask me why. I don't know.
I believe Mathias will release another stack overflow really soon. Meanwhile, here's some proof:

Proof of Concept

Hey, I'm Fredrik. I'm from Sweden, born 1990, and I got a huge interest for information technology and information security. So far, I've been studying for three years at the Internation IT College of Sweden and one year at the Royal Institute of Technology (Kista, Sweden). I'm one of the Co-Founders of Detectify. I'm working closely together with the swedish firm Young & Skilled. ...Not to forget, I'm the previous founder of Arctic Security. If you wish to contact me, please email me at h@ackack.net or follow me on twitter @Almroot.