Below an excerpt Chromium advisory:

What steps will reproduce the problem?
1. Any page with the string of characters will crash the chrome tab on a Mac
2. Just create any dummy page with the unicode characters, and the Mac Chrome tab will crash hard

What is the expected result?
Expect it not to crash

What happens instead?
It crashes

The vulnerability is very serious, as explained by the researcher that discovered it:

“This is pretty serious. You could imagine someone spamming this message in Hangouts/Gmail and just straight-up force crashing all Mac Chrome browsers,” the developer said.

This means that an ill-intentioned could share the 13-characters string on social media, for example through Facebook walls or timelines, in order to exploit the Mac Chrome crash vulnerability..

“We did some basic testing and it seems that the crash doesn’t always occur. In select cases when Chrome renders text differently, Mac users see 13 blank rectangles (▯▯▯▯▯ ▯▯▯ ▯▯▯▯▯) instead of the tab crashing, though they never see the proper characters.”

Waiting for a fix of the issue, do not use the sequence of 13 characters while sharing content via Twitter, Facebook or G+.

Pierluigi Paganini

(Security Affairs – Chrome Crash, hacking)