New submission from anthony shaw <anthonys...@apache.org>:
Providing an (invalid) input to the parser causes an exponentially-slow DoS to
the Python executable in 3.10.
e.g.
python3.10 -c "{{{{{{{{{{{{{{{{{{{{{:"
takes ~2 seconds
python3.10 -c "{{{{{{{{{{{{{{{{{{{{{{{{:"
takes ~22 seconds
Tested this all the way up to
d{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{{```{{{{{{{ef f():y
which took over an hour
----------
components: Parser
keywords: 3.10regression
messages: 412972
nosy: anthonypjshaw, lys.nikolaou, pablogsal
priority: normal
severity: normal
status: open
title: Parser hanging on stacked { tokens
type: crash
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46707>
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