Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=789

There is a large heap overflow in reading an ATF image to a Bitmap object. To reproduce the issue, load the attach file '4' using LoadImage.swf as follows:

LoadImage.swf?img=4


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39827.zip