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CVE-2020-10531: ICU-20958 Prevent SEGV_MAPERR in UnicodeString::doAppend() by FrankYFTang · Pull Request #971 · unicode-org/icu
An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.
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