{"id":"CVE-2019-9721","details":"A denial of service in the subtitle decoder in FFmpeg 3.2 and 4.1 allows attackers to hog the CPU via a crafted video file in Matroska format, because handle_open_brace in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.","modified":"2026-08-17T05:26:11.512492Z","published":"2019-03-12T09:29:00.577Z","related":["SUSE-SU-2021:2919-1","SUSE-SU-2021:2929-1","openSUSE-SU-2021:2919-1"],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"18.04"},{"last_affected":"18.04"},{"introduced":"18.10"},{"last_affected":"18.10"},{"introduced":"19.04"},{"last_affected":"19.04"}],"source":"CPE_STRING","vendor_product":"canonical:ubuntu_linux"}]},"references":[{"type":"WEB","url":"http://www.securityfocus.com/bid/107384"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3967-1/"},{"type":"FIX","url":"https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65"},{"type":"FIX","url":"https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.ffmpeg.org/ffmpeg.git","events":[{"introduced":"340cea9f22c162e10d120835661e132721b7454b"},{"last_affected":"3c1ecb057d7621e57968624aa15ad3e9efc819f7"},{"fixed":"894995c41e0795c7a44f81adc4838dedc3932e65"}],"database_specific":{"cpe":["cpe:2.3:a:ffmpeg:ffmpeg:3.2:*:*:*:*:*:*:*","cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"3.2"},{"last_affected":"3.2"},{"introduced":"4.1"},{"last_affected":"4.1"}],"source":["CPE_STRING","REFERENCES"]}}],"versions":["3.2","4.1","n4.2-dev","n4.1-dev","n3.5-dev","n3.4-dev","n3.3-dev","n3.2-dev"],"database_specific":{"vanir_signatures_modified":"2026-08-17T05:26:11Z","vanir_signatures":[{"target":{"file":"libavcodec/htmlsubtitles.c"},"deprecated":false,"digest":{"line_hashes":["181052376676104601782979859616773957010","114335331683057061847747733341231002884","52182576610393413327815494532710655027","151988408299784471571915177291850664201","205800561400509182498662806663250084866","276078855066844007631535584051836444593","154285558137714227043646505153518954530","291842367137479557043398546324464656376","258470655490914664899790479643506909951","315927009099581820947690650327589782134","208572855481831454275286035163998736879","168711716481488611153412673907818853193"],"threshold":0.9},"id":"CVE-2019-9721-db6040e3","signature_type":"Line","signature_version":"v1","source":"https://git.ffmpeg.org/ffmpeg.git@894995c41e0795c7a44f81adc4838dedc3932e65"},{"signature_type":"Function","signature_version":"v1","source":"https://git.ffmpeg.org/ffmpeg.git@894995c41e0795c7a44f81adc4838dedc3932e65","target":{"file":"libavcodec/htmlsubtitles.c","function":"handle_open_brace"},"deprecated":false,"digest":{"function_hash":"279534106679732723151319424601863156938","length":499},"id":"CVE-2019-9721-ff8fb535"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-9721.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ffmpeg/ffmpeg","events":[{"introduced":"340cea9f22c162e10d120835661e132721b7454b"},{"last_affected":"3c1ecb057d7621e57968624aa15ad3e9efc819f7"},{"fixed":"273f2755ce8635d42da3cde0eeba15b2e7842774"}],"database_specific":{"cpe":["cpe:2.3:a:ffmpeg:ffmpeg:3.2:*:*:*:*:*:*:*","cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"3.2"},{"last_affected":"3.2"},{"introduced":"4.1"},{"last_affected":"4.1"}],"source":["CPE_STRING","REFERENCES"]}}],"versions":["3.2","4.1","n3.2.13","n3.2.12","n3.2.11","n4.1-dev","n3.2.10","n3.2.9","n3.5-dev","n3.2.8","n3.2.7","n3.2.6","n3.2.5","n3.4-dev","n3.2.4","n3.2.3","n3.2.2","n3.2.1","n3.2","n3.3-dev","n3.2-dev"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-9721.json","vanir_signatures_modified":"2026-08-17T05:26:11Z","vanir_signatures":[{"digest":{"function_hash":"51195086334001458191859035190219042570","length":3610},"id":"CVE-2019-9721-1e4b4ede","signature_type":"Function","signature_version":"v1","source":"https://github.com/ffmpeg/ffmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774","target":{"file":"libavcodec/htmlsubtitles.c","function":"ff_htmlmarkup_to_ass"},"deprecated":false},{"id":"CVE-2019-9721-efb6ae89","signature_type":"Line","signature_version":"v1","source":"https://github.com/ffmpeg/ffmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774","target":{"file":"libavcodec/htmlsubtitles.c"},"deprecated":false,"digest":{"line_hashes":["181052376676104601782979859616773957010","114335331683057061847747733341231002884","52182576610393413327815494532710655027","151988408299784471571915177291850664201","143530476180291881434987183528048468203","20671168889515778463202263099394878314","117734745311139794259276495167403311113","247691314197916473622205852293270336349","91970035849042864838408869607449612939","298548214798456625181670453837162301144","51594798183235078235674705393957355135","244888744203267073148994254791264550488"],"threshold":0.9}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}