CVE-2026-75146 — FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c
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 …
Published: 2026-08-19 · CVSS: 7.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7