Excelize ColumnNameToNumber: int64 overflow yields an out-of-domain coordinate with nil error, causing negative slice index panic on r="0" rows

{
  "id": "769d4115d321b0033daedf36d685a89892a21ca372c89d623f85a85de340e857",
  "url": "https://osv.dev/vulnerability/GHSA-c85p-xxjj-2r75",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize ColumnNameToNumber: int64 overflow yields an out-of-domain coordinate with nil error, causing negative slice index panic on r=\"0\" rows",
    "summary": "### Summary `ColumnNameToNumber` (lib.go:220-237) accumulates the bijective base-26 value of a column name in an int64 with only an upper-bound check (`col > MaxColumns`) applied after the loop and no overflow detection. A 14-letter column name whose true value is 3·2⁶⁴ — e.g. **`VGWQHXLSDVIKWV`** — wraps to `col = 0` and passes the guard, so `CellNameToCoordinates(\"VGWQHXLSDVIKWV1\")` returns `(col=0, row=1, err=nil)`. When normalizing a `r=\"0\"` row, `checkSheetR0` (excelize.go:417-443, called from `checkSheet` at excelize.go:405) runs its `checkRow` closure with `col = 0`: `colIdx := col - 1` becomes **-1**, and `sheetData.Row[rowIdx].C[-1]` (excelize.go:424) raises an unrecovered `panic: runtime error: index out of range [-1]`, killing the host process. ### Details - The row side of the same coordinate gate is enforced (`checkRowNum` at excelize.go:342-350 bounds `r` before the `make([]xlsxRow, row)` allocation; this includes the fix for GHSA-h69g-9hx6-f3v4 / CVE-2026-54063, present in the audited commit). The **column** side is not: `checkSheet`/`lastRowNum`/`checkSheetR0` treat `err == nil` from `CellNameToCoordinates` as proof of an in-domain coordinate (excelize.go:356, :438), which is unsound because of the wrap-around above. - The same unsound gate also feeds `ws.SheetData.Row[rowIdx].C[colNum-1]` in `xlsxWorksheet.checkRow` (rows.go:969): a row combining a valid large column (e.g. `XFD1`) with an overflowed column panics identically. - Reachable from any `workSheetRe",
    "evidence": "osv:GHSA-c85p-xxjj-2r75",
    "products": [
      {
        "name": {
          "value": "github.com/xuri/excelize/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.11.1-0.20260910071107-696050fbf14e",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "github.com/xuri/excelize",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-c85p-xxjj-2r75",
      "aliases": [
        "CVE-2026-107217",
        "GHSA-c85p-xxjj-2r75"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "2.0.0"
                },
                {
                  "fixed": "2.11.1-0.20260910071107-696050fbf14e"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/xuri/excelize/v2",
            "purl": "pkg:golang/github.com/xuri/excelize/v2",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-c85p-xxjj-2r75/GHSA-c85p-xxjj-2r75.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "1.1.0"
                },
                {
                  "last_affected": "1.4.1"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/xuri/excelize",
            "purl": "pkg:golang/github.com/xuri/excelize",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-c85p-xxjj-2r75/GHSA-c85p-xxjj-2r75.json"
          }
        }
      ],
      "modified": "2026-10-07T20:30:05.831565732Z",
      "provider": "osv",
      "references": [
        "https://github.com/qax-os/excelize/security/advisories/GHSA-c85p-xxjj-2r75",
        "https://github.com/qax-os/excelize/pull/2394",
        "https://github.com/qax-os/excelize/commit/696050fbf14e74e96a58eef2b16aaf72f381a6a8",
        "https://github.com/qax-os/excelize"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-129",
          "CWE-190"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-07T20:23:31Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107217",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 97232,
  "published_at": "2026-10-07T20:23:31+00:00"
}