CVE-2026-75146 (GCVE-0-2026-75146)
Vulnerability from cvelistv5 – Published: 2026-08-19 16:28 – Updated: 2026-10-27 10:14 X_Open Source
VLAI
EPSS
VEX
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 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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 14:55 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24093 | issue-tracking |
| https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/65b0… | patch |
| https://www.vulncheck.com/advisories/ffmpeg-out-o… | third-party-advisory |
Impacted products
Date Public
2026-08-04 00:00
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