Excelize: GetStyle panics on a negative fillId, borderId or fontId in styles.xml

{
  "id": "288f57b296a407bea6bb382b7c09f24d9a924fa37c758db5f4fb4014d2c5a4a2",
  "url": "https://osv.dev/vulnerability/GHSA-5h23-36rv-pm65",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize: GetStyle panics on a negative fillId, borderId or fontId in styles.xml",
    "summary": "## Summary `File.GetStyle` indexes the fill, border and font tables with values taken straight out of `xl/styles.xml`, and the conditions gating those lookups check only the upper bound. A workbook whose `cellXfs` entry carries `fillId=\"-1\"`, `borderId=\"-1\"` or `fontId=\"-1\"` reaches a negative slice index and panics. excelize has no `recover()`, so the panic leaves `GetStyle` and takes the calling process with it. Same defect class as GHSA-48hm-4h8j-58fg, the negative shared-string index, in a different file. That one was fixed by adding the missing lower bound; these three sites still lack it. ## Where it is `styles.go`, in `GetStyle`, lines 1683, 1686 and 1689: ```go xf := s.CellXfs.Xf[idx] if extractStyleCondFuncs[\"fill\"](xf, s) { f.extractFills(s.Fills.Fill[*xf.FillID], s, style) } if extractStyleCondFuncs[\"border\"](xf, s) { f.extractBorders(s.Borders.Border[*xf.BorderID], s, style) } if extractStyleCondFuncs[\"font\"](xf, s) { style.Font = extractFont(s.Fonts.Font[*xf.FontID]) } ``` The conditions, at lines 1171 to 1185, bound only the top: ```go \"fill\": func(xf xlsxXf, s *xlsxStyleSheet) bool { return (xf.ApplyFill == nil || (xf.ApplyFill != nil && *xf.ApplyFill)) && xf.FillID != nil && s.Fills != nil && *xf.FillID < len(s.Fills.Fill) }, ``` `*xf.FillID < len(...)` is satisfied by any negative value. `FillID`, `BorderID` and `FontID` are `*int` unmarshalled directly from the `fillId`, `borderId` and `fontId` attributes, so the value is whatever the file says. The border a",
    "evidence": "osv:GHSA-5h23-36rv-pm65",
    "products": [
      {
        "name": {
          "value": "github.com/xuri/excelize/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.11.1-0.20260731010303-ae2113b410e5",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-5h23-36rv-pm65",
      "aliases": [
        "CVE-2026-107225",
        "GHSA-5h23-36rv-pm65"
      ],
      "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": "2.8.0"
                },
                {
                  "fixed": "2.11.1-0.20260731010303-ae2113b410e5"
                }
              ]
            }
          ],
          "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-5h23-36rv-pm65/GHSA-5h23-36rv-pm65.json"
          }
        }
      ],
      "modified": "2026-10-07T20:30:06.927051800Z",
      "provider": "osv",
      "references": [
        "https://github.com/qax-os/excelize/security/advisories/GHSA-5h23-36rv-pm65",
        "https://github.com/qax-os/excelize/pull/2367",
        "https://github.com/qax-os/excelize/commit/ae2113b410e51f6a141c396a59eda8c42b91bc22",
        "https://github.com/qax-os/excelize"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-129",
          "CWE-20"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-07T20:22:39Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107225",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 97238,
  "published_at": "2026-10-07T20:22:39+00:00"
}