{"id":"CVE-2026-75146","state":"PUBLISHED","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.","publishedAt":"2026-08-19T16:28:19.356Z","updatedAt":"2026-10-27T10:14:32.933Z","severity":{"score":7.2,"label":"High","version":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["FFmpeg FFmpeg"],"affected":[{"vendor":"FFmpeg","product":"FFmpeg","packageURL":"pkg:github/FFmpeg/FFmpeg","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"65b0dab903e5975e036b30ecc58f5935d4f151e0","versionType":"git"}],"repo":"https://code.ffmpeg.org/FFmpeg/FFmpeg"}],"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"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/75xxx/CVE-2026-75146.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-75146","state":"PUBLISHED","datePublished":"2026-08-19T16:28:19.356Z","dateUpdated":"2026-10-27T10:14:32.933Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-17T18:39:57.662Z"},"containers":{"cna":{"title":"FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c","descriptions":[{"lang":"en","value":"FFmpeg before commit 65b0dab contains an out-of-bounds read in the DASH demuxer (libavformat/dashdec.c). 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