Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile

{
  "id": "d70991a8e275420aa4b034d00af5af138ad7dc2d70b5529d0ac4c905035ef6fe",
  "url": "https://osv.dev/vulnerability/GHSA-jrfj-fhj2-jjvm",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile",
    "summary": "Opening a file whose first eight bytes are the OLE magic number sends excelize down the decryption path whether or not the caller set a password, or supports encrypted workbooks at all. `openReaderAt` (excelize.go:198-215) branches on the header alone, and `agileDecrypt` calls `convertPasswdToKey` before the verifier hash is checked, so the key-derivation loop runs `spinCount` times regardless. `spinCount` (crypt.go:98) is a plain `int` filled by a bare `xml.Unmarshal` of the file's own EncryptionInfo stream. Nothing bounds it. A 3072-byte file with spinCount 100000000 makes `OpenFile` take 58.65s on v2.11.0 with default options, then return `zip: not a valid zip file`. It is linear at about 0.6 microseconds per iteration and the attacker picks the number, so 1e9 is roughly ten minutes. Nothing on the path takes a `context.Context`, so the caller cannot cancel it; in an HTTP handler the write timeout returns a response while the goroutine keeps spinning. Memory stays flat at 24 MB, so nothing reclaims it either. ``` v2.5.0 spinCount=10000000 5.307s v2.9.1 spinCount=10000000 5.444s v2.11.0 spinCount=10000000 7.529s v2.11.0 spinCount=100000000 58.654s ``` The loop arrived with `crypt.go` in v2.3.1 and is unchanged through v2.11.0. Excel and LibreOffice write spinCount 100000, which costs 61ms here, so a ceiling well above the legitimate value would cost real files nothing. This is availability only, and it is not a vulnerability for a program that only opens files its own opera",
    "evidence": "osv:GHSA-jrfj-fhj2-jjvm",
    "products": [
      {
        "name": {
          "value": "github.com/xuri/excelize/v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.11.1-0.20260906004932-2badfcd5841d",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-jrfj-fhj2-jjvm",
      "aliases": [
        "CVE-2026-107219",
        "GHSA-jrfj-fhj2-jjvm"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "2.3.1"
                },
                {
                  "fixed": "2.11.1-0.20260906004932-2badfcd5841d"
                }
              ]
            }
          ],
          "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-jrfj-fhj2-jjvm/GHSA-jrfj-fhj2-jjvm.json"
          }
        }
      ],
      "modified": "2026-10-07T20:30:05.832809888Z",
      "provider": "osv",
      "references": [
        "https://github.com/qax-os/excelize/security/advisories/GHSA-jrfj-fhj2-jjvm",
        "https://github.com/qax-os/excelize/pull/2389",
        "https://github.com/qax-os/excelize/commit/2badfcd5841d0d88b0ffea119f5a2f3c53b4910b",
        "https://github.com/qax-os/excelize"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-07T20:23:22Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107219",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 97231,
  "published_at": "2026-10-07T20:23:22+00:00"
}