CVE-2007-4770 (international_components_for_unicode)
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libicu in International Components for Unicode (ICU) 3.8.1 and earlier attempts to process backreferences to the nonexistent capture group zero (aka \0), which might allow context-dependent attackers to read from, or write to, out-of-bounds memory locations, related to corruption of REStackFrames.
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2007-4770
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