GHSA-RXCJ-4PJ5-74GR Excelize: GetConditionalFormats indexes conditional-formatting rule sub-elements with no length or nil check

Summary GetConditionalFormats reads sub-elements of a straight out of xl/worksheets/sheetN.xml and indexes them without checking length, and in one case without checking for nil. Three rule types are affected: cellIs, dataBar and colorScale. A workbook with a rule that is missing a child a real...