{"id":"CVE-2026-75146","revision":null,"records":[{"revision":"4620d619cf204f329b1b460e64cb4f5e","observedAt":"2026-10-27T12:09:21.929+00:00","statement":{"source":"cve-program","id":"CVE-2026-75146","aliases":[],"title":"FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c","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.","state":0,"publishedAt":"2026-08-19T16:28:19.356+00:00","modifiedAt":"2026-10-27T10:14:32.933+00:00","affected":[{"ecosystem":"Vendor product","name":"FFmpeg","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"FFmpeg\",\n                    \"product\": \"FFmpeg\",\n                    \"repo\": \"https://code.ffmpeg.org/FFmpeg/FFmpeg\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"65b0dab903e5975e036b30ecc58f5935d4f151e0\",\n                            \"versionType\": \"git\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:github/FFmpeg/FFmpeg\"\n                }"}],"metrics":[{"system":"CVSS 4.0","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,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","score":8.1,"severity":"HIGH"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-75146","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-75146","identifiers":["CVE-2026-75146"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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