Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/65b0dab903e5975e036b30ecc58f5935d4f
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24093
- https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-in-dash-demuxer-v
FAQ
What is CVE-2026-75146?
CVE-2026-75146 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-75146?
CVE-2026-75146 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-75146?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.