CVE-2026-75146 - FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c
Brief
CVE ID : CVE-2026-75146
Published : Aug. 19, 2026, 4:28 p. m.
- 40 minutes ago
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: 8.1
- HIGH
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