CVE-2019-9719: Libav

High severity, CVSS 8.8. EPSS: 2% chance of exploitation in the next 30 days.

A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c misuses snprintf. NOTE: Third parties dispute that this is a vulnerability because “no evidence of a vulnerability is provided” and only “a generic warning from a static code analysis” is provided

Affected products

• Libav Libav: up to and including 12.3

Published 2019-09-19. Last modified 2026-06-17.