A denial of service in the subtitle decoder in FFmpeg 3.2 and 4.1 allows attackers to hog the CPU via a crafted video file in Matroska format, because handleopenbrace in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.
{
"sources": [
{
"modified": "2024-11-21T04:52:10.573Z",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2019-9721",
"id": "CVE-2019-9721",
"imported": "2025-10-18T14:07:17.044Z",
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2019-9721",
"published": "2019-03-12T09:29:00.577Z"
}
],
"license": "CC-BY-4.0"
}