In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because ffhtmlmarkupto_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.
{
"unresolved_ranges": [
{
"extracted_events": [
{
"last_affected": "18.04"
}
],
"source": "CPE_FIELD",
"cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
},
{
"extracted_events": [
{
"last_affected": "18.10"
}
],
"source": "CPE_FIELD",
"cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*"
},
{
"extracted_events": [
{
"last_affected": "19.04"
}
],
"cpe": "cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*",
"source": "CPE_FIELD"
},
{
"extracted_events": [
{
"last_affected": "9.0"
}
],
"cpe": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
"source": "CPE_FIELD"
}
]
}{
"extracted_events": [
{
"introduced": "0"
},
{
"last_affected": "3.2"
},
{
"last_affected": "4.1"
}
],
"source": "CPE_FIELD",
"cpe": [
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"cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:*"
]
}