GHSA-FQ3V-74GV-27GM Excelize: Unbounded <col max> attribute is loaded with no MaxColumns check and expanded per-column by flatCols(), so any column mutator hangs or OOMs the process

Summary The max attribute of a element in xl/worksheets/sheetN.xml is read verbatim on open with no check against MaxColumns, and flatCols then walks Min..Max doing a deepcopy.Copy and append per iteration. Executed: max="300000", only about 18x past the real 16384 limit, cost 46.2 s of CPU and 1...

PT-2026-107662

Name of the Vulnerable Software and Affected Versions Excelize versions 2.1.0 through 2.11.0 Description An issue exists where the library fails to validate the Min and Max attributes of column ranges loaded from a file against the worksheet column limit. When a crafted worksheet contains an...