In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.
{
"license": "CC-BY-4.0",
"sources": [
{
"id": "CVE-2021-46143",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-46143",
"imported": "2025-10-10T21:54:56.820Z",
"published": "2022-01-06T04:15:07.017Z",
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46143",
"modified": "2025-05-05T17:17:28.820Z"
}
]
}