See how xlsxio compares to other vendors in security performance
xlsxio through 0.2.37 contains a NULL pointer dereference vulnerability in mainsheetgetsheetfileexpatcallbackelementstart() in lib/xlsxioread.c that allows attackers to crash applications via crafted files. Attackers can supply a .xlsx file whose workbook.xml.rels contains a worksheet Relationship lacking an Id attribute, crashing the process when xlsxioreadsheetopen() is called.