Excelize: A Zip64 uncompressed-size of 2^63 panics OpenFile/OpenReader

{
  "id": "4cf905398534fa92fa88ac8b25afa352a484395a4600a308b1886594a7358640",
  "url": "https://osv.dev/vulnerability/GHSA-fw94-4wwp-w8pw",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize: A Zip64 uncompressed-size of 2^63 panics OpenFile/OpenReader",
    "summary": "### Summary A Zip64 uncompressed-size of 2^63 casts to a negative int64 that bypasses the unzip-size guard and reaches make([]byte, 0, negativeCap) A Zip64 uncompressed-size in the range [2^63, 2^64) casts to a negative `int64` in `zip.File.FileInfo().Size()`, and `ReadZipReader` does signed arithmetic on that value, so the total-decompression guard is bypassed and the negative size reaches `make([]byte, 0, size)` in `readFile`. A 159-byte crafted file panics `OpenFile` and `OpenReader` with `runtime error: makeslice: cap out of range`. The guard, at `lib.go:44-46` on HEAD `ae2113b`: ```go fileSize := v.FileInfo().Size() unzipSize += fileSize if unzipSize > f.options.UnzipSizeLimit { return fileList, worksheets, newUnzipSizeLimitError(f.options.UnzipSizeLimit) } ``` `FileInfo().Size()` returns `int64(UncompressedSize64)`. `UncompressedSize64` is read from the Zip64 extended-information extra record in the central directory and is fully attacker controlled, so any value with the top bit set arrives as a negative `int64`. `unzipSize` then goes negative and the comparison against `UnzipSizeLimit` (default `1000 << 24`, `templates.go:193`) is false no matter how many such entries the archive contains. The same negative value also fails the two stream-to-temp checks at `lib.go:53` and `lib.go:64` (`fileSize > f.options.UnzipXMLSizeLimit`), so the entry is not diverted to a temp file and control reaches `readFile`: ```go // lib.go:150 dat := make([]byte, 0, file.FileInfo().Size()) ",
    "evidence": "osv:GHSA-fw94-4wwp-w8pw",
    "products": [
      {
        "name": {
          "value": "github.com/xuri/excelize/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.11.1-0.20260805032953-db93f8d89de7",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-fw94-4wwp-w8pw",
      "aliases": [
        "CVE-2026-107224",
        "GHSA-fw94-4wwp-w8pw"
      ],
      "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": "2.1.0"
                },
                {
                  "fixed": "2.11.1-0.20260805032953-db93f8d89de7"
                }
              ]
            }
          ],
          "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-fw94-4wwp-w8pw/GHSA-fw94-4wwp-w8pw.json"
          }
        }
      ],
      "modified": "2026-10-07T20:30:07.330722837Z",
      "provider": "osv",
      "references": [
        "https://github.com/qax-os/excelize/security/advisories/GHSA-fw94-4wwp-w8pw",
        "https://github.com/qax-os/excelize/pull/2369",
        "https://github.com/qax-os/excelize/commit/db93f8d89de71589069a54d1b998af02e3c5f7cd",
        "https://github.com/qax-os/excelize"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-190",
          "CWE-681"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-07T20:22:45Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107224",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 97243,
  "published_at": "2026-10-07T20:22:45+00:00"
}