Heap-based buffer overflow in the doInterval function in regexcmp.cpp
in libicu in International Components for Unicode (ICU) 3.8.1 and
earlier allows context-dependent attackers to cause a denial of
service (memory consumption) and possibly have unspecified other
impact via a regular expression that writes a large amount of data to
the backtracking stack. NOTE: some of these details are obtained from
third party information.
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