CVE-2026-75146
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
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 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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| FFmpeg | FFmpeg | 0 < 65b0dab903e5975e036b30ecc58f5935d4f151e0 | affected |
Weaknesses
- CWE-125: Out-of-bounds Read
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
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