fkie_cve-2026-107221

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.0.0 to 2.11.0, checkRow sizes its target cell slice from the last cell in XML document order and then re-scatters every cell by its explicit column reference. GetCellValue reaches workSheetReader and checkRow, where targetList is too short for an earlier out-of-order cell. When a crafted row places a higher-column cell before a lower-column final cell and a non-streaming worksheet API reads the sheet, the earlier cell's column index exceeds the slice length derived from the final cell, allowing an attacker to cause an unrecovered panic and terminate the process. No fixed version is available as of this review.

GHSA-8mcq-6wmr-jrjv — Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost…

Affected: Go: github.com/xuri/excelize/v2

## Affected versions and vulnerable location

- Confirmed at `ae2113b` (current HEAD). - Sink: `rows.go:967` `ws.SheetData.Row[rowIdx].C[colNum-1] = *colData` inside `checkRow`. - `checkRow` computes `lastCol` from the column of the last cell in document order (`rows.go:940`), allocates `targetList` of that length, then re-scatters every source cell into `C[colNum-1]`.

## Root cause

The slice is sized from the last cell's column, but cells are not required to be column-sorted in the XML. A cell that appears earlier in the row but references a higher column than the last cell has `colNum-1 >= len(targetList)`, so the assignment writes out of range. `MaxColumns`/`TotalRows` do not help, every individual column is valid; the bug is the ordering assumption, not magnitude.

## Attacker model and reachability

Any service that opens an untrusted spreadsheet and calls a worksheet API that goes through `workSheetReader -> checkRow` (`excelize.go:332`): `GetCellValue`, `GetCellFormula`, `CalcCellValue`, `GetMergeCells`, `SetCellValue`, and essentially every non-streaming worksheet call. (The streaming `GetRows`/`Rows()` SAX path does not trigger it.) Unauthenticated, deterministic, unrecovered panic -> process crash.

## Proof of concept (executed)

Crafted `xl/worksheets/sheet1.xml` with a row whose cells are out of column order and whose earlier cell exceeds the last cell's column:

```xml <row r="1"><c r="D1"><v>4</v></c><c r="C1"><v>3</v></c></row> ```

`GetCellValue("Sheet1","…

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fkie_cve-2026-107221

GHSA-8mcq-6wmr-jrjv — Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost…