Excelize: Nil-pointer dereference in GetSlicers when a worksheet has extLst present but no drawing element

{
  "id": "eada02cf0a10fedebc9c360247a49886d1da573e06d01f140c8da6faa766da65",
  "url": "https://osv.dev/vulnerability/GHSA-r7x5-4969-99p7",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize: Nil-pointer dereference in GetSlicers when a worksheet has extLst present but no drawing element",
    "summary": "### Summary GetSlicers guards only `if ws.ExtLst == nil { return }` (slicer.go:816-818) and then immediately dereferences `ws.Drawing.RID` with no nil check on ws.Drawing itself. `Drawing` and `ExtLst` are two independently optional child elements of in xl/worksheets/sheetN.xml, populated separately by encoding/xml depending on whether each tag is present. I executed a PoC: took a plain NewFile() workbook (no drawing, no slicer), saved it, then injected a bare `` immediately before `` in xl/worksheets/sheet1.xml (no other change, no drawing element present) and called GetSlicers. Result: `runtime error: invalid memory address or nil pointer dereference`, confirmed at the ws.Drawing.RID line via stack trace. ### Reachability / who can trigger this Unauthenticated: any application that opens an untrusted .xlsx and calls the public `File.GetSlicers(sheet)` API. The trigger is a single empty XML tag with no valid slicer or drawing content required at all, making it an even smaller/simpler payload than candidate 1. ### Proof of Concept / Reproduction **Method:** 1) Reused the existing clone at C:\\Users\\vatsa\\AppData\\Local\\Temp\\claude\\D--\\59901fa2-b549-40e1-a433-30c8a3d01718\\scratchpad\\CVE-Hunt-10k\\repos\\qax-os__excelize (origin=https://github.com/qax-os/excelize.git, branch master up to date, commit e81f05008b33232151a58f06474fad5f70c4d060 dated 2026-09-27, `git describe`=v2.11.0-42-ge81f050, i.e. 42 commits past the v2.11.0 tag). 2) Manually re-read the cited source myself (not t",
    "evidence": "osv:GHSA-r7x5-4969-99p7",
    "products": [
      {
        "name": {
          "value": "github.com/xuri/excelize/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.11.1-0.20260929015830-8ffeb07ec9a3",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-r7x5-4969-99p7",
      "aliases": [
        "CVE-2026-107213",
        "GHSA-r7x5-4969-99p7",
        "GO-2026-6687"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "2.9.0"
                },
                {
                  "fixed": "2.11.1-0.20260929015830-8ffeb07ec9a3"
                }
              ]
            }
          ],
          "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-r7x5-4969-99p7/GHSA-r7x5-4969-99p7.json"
          }
        }
      ],
      "modified": "2026-10-19T21:41:00.604164450Z",
      "provider": "osv",
      "references": [
        "https://github.com/qax-os/excelize/security/advisories/GHSA-r7x5-4969-99p7",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-107213",
        "https://github.com/qax-os/excelize/pull/2434",
        "https://github.com/qax-os/excelize/commit/8ffeb07ec9a350410f6922313f6b7e4f5cc79241",
        "https://github.com/qax-os/excelize"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-476"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-07T18:17:18Z",
        "github_reviewed_at": "2026-10-08T16:50:08Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107213",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 376767,
  "published_at": "2026-10-08T16:50:08+00:00"
}

{
  "id": "b9a7bbe131cffcfa0b79183ef4cf5f4becb2efd7bec65cd6db7658aae344785d",
  "url": "https://osv.dev/vulnerability/GO-2026-6687",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Nil-pointer dereference in GetSlicers when a worksheet has extLst present but no drawing element in github.com/xuri/excelize",
    "summary": "Nil-pointer dereference in GetSlicers when a worksheet has extLst present but no drawing element in github.com/xuri/excelize",
    "evidence": "osv:GO-2026-6687",
    "products": [
      {
        "name": {
          "value": "github.com/xuri/excelize/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.11.1-0.20260929015830-8ffeb07ec9a3",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "GO-2026-6687",
      "aliases": [
        "CVE-2026-107213",
        "GHSA-r7x5-4969-99p7",
        "GO-2026-6687"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "2.9.0"
                },
                {
                  "fixed": "2.11.1-0.20260929015830-8ffeb07ec9a3"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/xuri/excelize/v2",
            "purl": "pkg:golang/github.com/xuri/excelize/v2",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://vuln.go.dev/ID/GO-2026-6687.json"
          },
          "ecosystem_specific": {
            "imports": [
              {
                "path": "github.com/xuri/excelize/v2",
                "symbols": [
                  "File.DeleteSlicer",
                  "File.GetSlicers"
                ]
              }
            ]
          }
        }
      ],
      "modified": "2026-10-19T21:31:49.923387703Z",
      "provider": "osv",
      "references": [
        "https://github.com/qax-os/excelize/security/advisories/GHSA-r7x5-4969-99p7",
        "https://github.com/qax-os/excelize/commit/8ffeb07ec9a350410f6922313f6b7e4f5cc79241",
        "https://github.com/qax-os/excelize/pull/2434"
      ],
      "provider_metadata": {
        "url": "https://pkg.go.dev/vuln/GO-2026-6687",
        "review_status": "REVIEWED"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107213",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 376690,
  "published_at": "2026-10-19T21:08:21+00:00"
}