{"id":"CVE-2026-75146","aliases":[],"title":"FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c","titleSource":"VulnCheck","descriptionSource":"VulnCheck","products":[{"vendor":"FFmpeg","name":"FFmpeg","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"65b0dab903e5975e036b30ecc58f5935d4f151e0","versionType":"git"}],"defaultStatus":"unaffected","source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-75146"}],"remediation":[],"description":"FFmpeg before commit 65b0dab contains an out-of-bounds read in the DASH demuxer (libavformat/dashdec.c). When a live DASH manifest is refreshed with a startNumber that is lower than the previous value, the current sequence number is driven negative. The fragment retrieval function checked only the upper bound before indexing the fragments array, allowing a negative index to be used and causing an out-of-bounds read. A malicious or misconfigured DASH server can trigger this by serving a live manifest with a decreasing startNumber across a manifest refresh.","severity":"high","score":7.2,"published":"2026-08-19T16:28:19.356Z","modified":"2026-10-27T10:14:32.933Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24093","https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/65b0dab903e5975e036b30ecc58f5935d4f151e0","https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-in-dash-demuxer-via-dashdec-c"],"sources":[{"name":"CVE","id":"CVE-2026-75146","modified":"2026-10-27T10:14:32.933Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-75146"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N","score":7.2},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","score":8.1}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T15:40:31.878Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}