CVE-2026-75146
Publication date 19 August 2026
Last updated 4 September 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| ffmpeg | 26.04 LTS resolute |
Vulnerable
|
| 24.04 LTS noble |
Fixed 7:6.1.1-3ubuntu5+esm13
|
|
| 22.04 LTS jammy |
Fixed 7:4.4.2-0ubuntu0.22.04.1+esm15
|
|
| 20.04 LTS focal |
Fixed 7:4.2.7-0ubuntu0.1+esm16
|
|
| 18.04 LTS bionic |
Fixed 7:3.4.11-0ubuntu0.1+esm15
|
|
| 16.04 LTS xenial |
Not affected
|
|
| libav | 26.04 LTS resolute | Not in release |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release | |
| 14.04 LTS trusty |
Needs evaluation
|
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Severity score breakdown
CVSS version:
Base score
7.2 · High
Vector: 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
Base score
8.1 · High
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8716-1
- FFmpeg vulnerabilities
- 3 September 2026