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Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile

Type: advisorySources: OSV

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, agile decryption accepts an attacker-controlled spinCount and performs that many password-key derivation iterations before verifier validation. OpenFile reaches agileDecrypt, which passes the unbounded spinCount to convertPasswdToKey before password verification. When a crafted OLE encrypted-workbook header supplies an excessive spinCount and the file is opened, the key-derivation loop performs unbounded attacker-selected work and cannot be cancelled, allowing an attacker to consume a CPU core for an attacker-controlled duration. No fixed version is available as of this review.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-107219
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 02:20 UTC · Revision 1

Source evidence

Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile

core-osv · Original source

Published 7 Oct 2026, 18:33 UTC

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, agile decryption accepts an attacker-controlled spinCount and performs that many password-key derivation iterations before verifier validation. OpenFile reaches agileDecrypt, which passes the unbounded spinCount to convertPasswdToKey before password verification. When a crafted OLE encrypted-workbook header supplies an excessive spinCount and the file is opened, the key-derivation loop performs unbounded attacker-selected work and cannot be cancelled, allowing an attacker to consume a CPU core for an attacker-controlled duration. No fixed version is available as of this review.

osv:CVE-2026-107219
Complete source record
{
  "id": "9b28f2ba08004b669cc413e9d93b2a387f628a928d76f29fc6577fcde91fa828",
  "url": "https://osv.dev/vulnerability/CVE-2026-107219",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile",
    "summary": "Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, agile decryption accepts an attacker-controlled spinCount and performs that many password-key derivation iterations before verifier validation. OpenFile reaches agileDecrypt, which passes the unbounded spinCount to convertPasswdToKey before password verification. When a crafted OLE encrypted-workbook header supplies an excessive spinCount and the file is opened, the key-derivation loop performs unbounded attacker-selected work and cannot be cancelled, allowing an attacker to consume a CPU core for an attacker-controlled duration. No fixed version is available as of this review.",
    "evidence": "osv:CVE-2026-107219",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-107219",
      "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": [
            {
              "repo": "https://github.com/qax-os/excelize",
              "type": "GIT",
              "events": [
                {
                  "introduced": "89465f41b5a29ac2e1debe16b8cb6f59c344f917"
                },
                {
                  "fixed": "2badfcd5841d0d88b0ffea119f5a2f3c53b4910b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "2.3.1"
                      },
                      {
                        "last_affected": "2.11.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2badfcd5841d0d88b0ffea119f5a2f3c53b4910b"
                      }
                    ],
                    "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",
            "v2.7.1",
            "v2.7.0",
            "v2.6.1",
            "v2.6.0",
            "v2.5.0",
            "v2.4.1",
            "v2.4.0",
            "v2.3.2",
            "v2.3.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107219.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.219214134Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107219.json",
        "https://github.com/qax-os/excelize/security/advisories/GHSA-jrfj-fhj2-jjvm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-107219",
        "https://github.com/qax-os/excelize/commit/2badfcd5841d0d88b0ffea119f5a2f3c53b4910b",
        "https://github.com/qax-os/excelize/pull/2389"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107219.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107219",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517316,
  "published_at": "2026-10-07T18:33:34.46+00:00"
}