Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

For example:

a = []
for i in range(22):
    a = [a, a]

b = plistlib.dumps(a, fmt=plistlib.FMT_BINARY)

The result is 130 bytes long on patched plistlib. But plistlib.dumps(b) will 
expand to a structure consuming almost a gigabyte of memory on unpatched 
plistlib. Increasing the level of nesting by one will duplicate memory 
consumption, so it is easy to consume all available memory on any computer.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32072>
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