{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.3.1"
              },
              {
                "last_affected": "2.11.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "89465f41b5a29ac2e1debe16b8cb6f59c344f917"
            },
            {
              "last_affected": "90ff348959dd842cbf3a4fbd93a78afbe18db476"
            }
          ],
          "repo": "https://github.com/qax-os/excelize",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-x2q3-8cjh-766f"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-789"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107215.json"
  },
  "details": "Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, extractPart allocates a byte slice directly from an attacker-controlled CFB directory-entry size before validating the sector chain or size domain. extractPart trusts the CFB directory entry streamSize for EncryptionInfo and EncryptedPackage allocations before validating the stream. When a crafted OLE compound file declares a negative or extremely large EncryptionInfo or EncryptedPackage stream size, the declared size reaches make with a negative length or forces a multi-gigabyte allocation, allowing an attacker to panic or exhaust process memory. No fixed version is available as of this review.",
  "id": "CVE-2026-107215",
  "modified": "2026-10-08T02:30:33.345308503Z",
  "published": "2026-10-07T17:48:03.233Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107215.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/qax-os/excelize/commit/5f636f9dcde55911f14290060b017f0cc88cd694"
    },
    {
      "type": "FIX",
      "url": "https://github.com/qax-os/excelize/pull/2396"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107215"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS"
}