Your reasoning is excellent -- it's only your basic assumptions that are wrong. ...
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ID Status Resolution Sev Product Comp Assignee Reporter Summary
11155 CLOS FIXE nor Sisyphus zziplib rider icesik ZZIPlib Library "zzip_open_shared_io()" Filename Buffer Overflow

File a new bug in the "zziplib" component of the "Sisyphus" product