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

{
  "id": "f7a7e87d03d738e02313b83d8341c09488f90633f782e52ff7ca79968c973c1d",
  "url": "https://osv.dev/vulnerability/CVE-2026-107225",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize: GetStyle panics on a negative fillId, borderId or fontId in styles.xml",
    "summary": "Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.8.0 to 2.11.0, GetStyle's fill, border, and font extraction predicates check only upper bounds for attacker-controlled style-table indices. File.GetStyle relies on extractStyleCondFuncs predicates that allow negative FillID, BorderID, and FontID values to reach slice indexing. When a crafted styles.xml supplies a negative fillId, borderId, or fontId and the application reads the style, a negative identifier passes the upper-bound-only predicate and becomes a negative slice index, allowing an attacker to panic while reading cell styling. No fixed version is available as of this review.",
    "evidence": "osv:CVE-2026-107225",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-107225",
      "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": [
            {
              "repo": "https://github.com/qax-os/excelize",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3b2b8ca8d6130723f494b773e462b03cfa011140"
                },
                {
                  "fixed": "ae2113b410e51f6a141c396a59eda8c42b91bc22"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "2.8.0"
                      },
                      {
                        "last_affected": "2.11.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ae2113b410e51f6a141c396a59eda8c42b91bc22"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.11.0",
            "v2.10.1",
            "v2.10.0",
            "v2.9.1",
            "v2.9.0",
            "v2.8.1",
            "v2.8.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107225.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.510059261Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107225.json",
        "https://github.com/qax-os/excelize/security/advisories/GHSA-5h23-36rv-pm65",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-107225",
        "https://github.com/qax-os/excelize/commit/ae2113b410e51f6a141c396a59eda8c42b91bc22",
        "https://github.com/qax-os/excelize/pull/2367"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-129",
          "CWE-20"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107225.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107225",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496090,
  "published_at": "2026-10-07T18:55:55.603+00:00"
}