Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost every worksheet read API

{
  "id": "ef9ee06fede1c6632066a3dd4cb463da5b432f5bd3f8afac999593ea70665300",
  "url": "https://osv.dev/vulnerability/GHSA-8mcq-6wmr-jrjv",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost every worksheet read API",
    "summary": "## 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 43 ``` `GetCellValue(\"Sheet1\",\"A1\")` (via `getCellStringFunc -> workSheetReader -> checkRow`) panick",
    "evidence": "osv:GHSA-8mcq-6wmr-jrjv",
    "products": [
      {
        "name": {
          "value": "github.com/xuri/excelize/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.11.1-0.20260816084418-46a5eb289448",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-8mcq-6wmr-jrjv",
      "aliases": [
        "CVE-2026-107221",
        "GHSA-8mcq-6wmr-jrjv"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "2.0.0"
                },
                {
                  "fixed": "2.11.1-0.20260816084418-46a5eb289448"
                }
              ]
            }
          ],
          "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-8mcq-6wmr-jrjv/GHSA-8mcq-6wmr-jrjv.json"
          }
        }
      ],
      "modified": "2026-10-07T20:30:05.928288242Z",
      "provider": "osv",
      "references": [
        "https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv",
        "https://github.com/qax-os/excelize/pull/2376",
        "https://github.com/qax-os/excelize/commit/46a5eb289448e40fbc7d3294589b03861fb822f0",
        "https://github.com/qax-os/excelize"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-07T20:23:08Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107221",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 97234,
  "published_at": "2026-10-07T20:23:08+00:00"
}