{"id":"CVE-2026-75145","summary":"FFmpeg Integer Narrowing Conversion OOB Memory Access in AV1 RTP Packetizer","details":"FFmpeg before commit b4c199c contains an incorrect integer narrowing conversion in the AV1 RTP packetizer (libavformat/rtpenc_av1.c). The OBU size is cast to long before comparison against the remaining frame size. On targets where long is 32 bits, including 64-bit Windows, sufficiently large OBU size values are sign-flipped by the narrowing cast, producing a negative value that passes the payload size check. This allows an oversized OBU to bypass the safety bound on affected platforms, leading to out-of-bounds memory access when the oversized value is subsequently used as a copy length.","modified":"2026-10-08T07:39:15.759287835Z","published":"2026-08-19T16:27:33.120Z","related":["openSUSE-SU-2026:11659-1","openSUSE-SU-2026:11665-1","openSUSE-SU-2026:11682-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75145.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-681"]},"references":[{"type":"WEB","url":"https://code.ffmpeg.org/FFmpeg/FFmpeg"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75145.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75145"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/ffmpeg-integer-narrowing-conversion-oob-memory-access-in-av1-rtp-packetizer"},{"type":"REPORT","url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24090"},{"type":"FIX","url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/b4c199c5906ff53368926c2a5839881f41957e7f"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://code.ffmpeg.org/FFmpeg/FFmpeg","events":[{"introduced":"0"},{"fixed":"b4c199c5906ff53368926c2a5839881f41957e7f"}]}],"versions":["n9.1-dev","n8.2-dev","n8.1-dev","n7.2-dev","n7.1-dev","n6.2-dev","n6.1-dev","n5.2-dev","n5.1-dev","n4.5-dev","n4.4-dev","n4.3-dev","n4.2-dev","n4.1-dev","n3.5-dev","n3.4-dev","n3.3-dev","n3.2-dev","n3.1-dev","n2.9-dev","n2.8-dev","n2.7-dev","n2.6-dev","n2.5-dev","n2.4-dev","n2.3-dev","n2.2-dev","n2.0","n2.1-dev","n1.3-dev","n1.2-dev","n1.1-dev","n0.12-dev","n0.11-dev","n0.8","N"],"database_specific":{"vanir_signatures":[{"signature_version":"v1","source":"https://code.ffmpeg.org/FFmpeg/FFmpeg@b4c199c5906ff53368926c2a5839881f41957e7f","target":{"file":"libavformat/rtpenc_av1.c"},"deprecated":false,"digest":{"line_hashes":["123634740780764270793455847189449018004","200791457857056029392735313457550745953","110406273147403960171518331405757524532","235082650345161628829360297442450494455"],"threshold":0.9},"id":"CVE-2026-75145-6e3cad5c","signature_type":"Line"},{"digest":{"function_hash":"218633532821867766148620393634019614045","length":5625},"id":"CVE-2026-75145-bdcb4dba","signature_type":"Function","signature_version":"v1","source":"https://code.ffmpeg.org/FFmpeg/FFmpeg@b4c199c5906ff53368926c2a5839881f41957e7f","target":{"file":"libavformat/rtpenc_av1.c","function":"ff_rtp_send_av1"},"deprecated":false}],"vanir_signatures_modified":"2026-10-08T07:39:15Z","source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75145.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N"}]}