FFmpeg 4.2.3 has a use-after-free via a crafted EXTINF duration in an m3u8 file because parse_playlist in libavformat/hls.c frees a pointer, and later that pointer is accessed in av_probe_input_format3 in libavformat/format.c. CREATE(Triage):(User=admin) [CVE-2020-13904|https://nvd.nist.gov/vuln/detail/CVE-2020-13904]
