An issue was discovered in zlibdecompressextra in modules/demux/mkv/util.cpp in VideoLAN VLC media player 3.x through 3.0.7. The Matroska demuxer, while parsing a malformed MKV file type, has a double free.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-12874.json"