CVE-2019-9718: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 1.6% chance of exploitation in the next 30 days.

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Affected products

• Canonical Ubuntu Linux: version 18.04 only; version 18.10 only; version 19.04 only
• Debian Debian Linux: version 9.0 only
• Ffmpeg Ffmpeg: version 3.2 only; version 4.1 only

Published 2019-03-12. Last modified 2026-06-17.