{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "0.2.37"
              },
              {
                "fixed": "0.2.37"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a8b74053127033fcd4788c1a3e651e47c79aa21d"
            }
          ],
          "repo": "https://github.com/brechtsanders/xlsxio",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110600.json"
  },
  "details": "xlsxio through 0.2.37 contains a NULL pointer dereference vulnerability in main_sheet_get_sheetfile_expat_callback_element_start() in lib/xlsxio_read.c that allows attackers to crash applications via crafted files. Attackers can supply a .xlsx file whose workbook.xml.rels contains a worksheet Relationship lacking an Id attribute, crashing the process when xlsxioread_sheet_open() is called.",
  "id": "CVE-2026-110600",
  "modified": "2026-10-17T02:30:15.923510799Z",
  "published": "2026-10-14T14:16:42.374Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110600.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://hackmd.io/@haind-pwn/xlsxio-relationship-missing-id-null-deref"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110600"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/xlsxio-through-0.2.37-null-pointer-dereference-via-worksheet-relationship-without-id"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/brechtsanders/xlsxio/issues/151"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/brechtsanders/xlsxio"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/brechtsanders/xlsxio/blob/0.2.37/lib/xlsxio_read.c#L851-L866"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "xlsxio through 0.2.37 NULL Pointer Dereference via Worksheet Relationship Without Id"
}