{"id":"CVE-2026-75141","aliases":[],"title":"FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing","titleSource":"VulnCheck","descriptionSource":"VulnCheck","products":[{"vendor":"FFmpeg","name":"FFmpeg","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781","versionType":"git"}],"defaultStatus":"unaffected","source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-75141"}],"remediation":[],"description":"FFmpeg before commit acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing a heap buffer overflow. A crafted HEVC input file triggers the overflow during muxing.","severity":"high","score":8.5,"published":"2026-08-19T16:24:01.813Z","modified":"2026-10-27T10:14:29.483Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24088","https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781","https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-in-hvcc-box-writer-via-hevc-muxing"],"sources":[{"name":"CVE","id":"CVE-2026-75141","modified":"2026-10-27T10:14:29.483Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-75141"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.5},{"source":"VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T09:10:31.970Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}