{"id":"CVE-2026-75146","title":"FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c","summary":"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 driv…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","cvssSource":"cna","cwe":["CWE-125"],"vendor":"FFmpeg","product":"FFmpeg","affected":["FFmpeg < 65b0dab903e5975e036b30ecc58f5935d4f151e0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-20T14:55:54.873673Z"},"published":"2026-08-19","updated":"2026-10-27","sourceUpdated":"2026-10-27T10:14:32.933Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-75146","references":[{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24093","label":"Pull Request"},{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/65b0dab903e5975e036b30ecc58f5935d4f151e0","label":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-in-dash-demuxer-via-dashdec-c"}],"tags":["cve.org"],"epss":0.00261,"epssPercentile":0.1784,"ingestedAt":"2026-10-27T16:11:59.272Z","slug":"CVE-2026-75146","body":"## Overview\n\nFFmpeg 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.\n\n## Affected\n\n- `FFmpeg < 65b0dab903e5975e036b30ecc58f5935d4f151e0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}