Description
In FFmpeg 4.0.1, due to a missing check for negative values of the mquant variable, the vc1_put_blocks_clamped function in libavcodec/vc1_block.c may trigger an out-of-array access while converting a crafted AVI file to MPEG4, leading to an information disclosure or a denial of service.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mythtv +2 | No fix yet | — |
| Ubuntu 26.04 LTS | mythtv +2 | No fix yet | — |
| Ubuntu 25.10 | mythtv +2 | No fix yet | — |
| Ubuntu 24.04 LTS | mythtv +2 | No fix yet | — |
| Ubuntu 22.04 LTS | mythtv +2 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mythtv +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mythtv +1 | No fix yet | — |
| Ubuntu 16.04 LTS | mythtv +2 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | ffmpeg | 3.4.2-4.12.4 | SUSE-SU-2018:3609-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP1 | ffmpeg-4 | 4.2.1-bp151.5.3.1 | openSUSE-SU-2020:0024-1 |
| SUSE Package Hub 15 | ffmpeg-4 | 4.2.1-bp151.5.3.1 | openSUSE-SU-2020:0024-1 |
| SUSE Package Hub 12 SP2 | ffmpeg-4 | 4.2.1-bp151.5.3.1 | openSUSE-SU-2020:0024-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ffmpeg-4 | 4.4-5.2 | openSUSE-SU-2024:10754-1 |
| openSUSE Leap 15.1 | ffmpeg-4 | 4.2.1-bp151.5.3.1 | openSUSE-SU-2020:0024-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | ffmpeg | 4.1-r0 | — |
| Alpine v3.23 | ffmpeg | 4.1-r0 | — |
| Alpine v3.22 | ffmpeg +1 | 4.1-r0 | — |
| Alpine v3.21 | ffmpeg +1 | 4.1-r0 | — |
| Alpine v3.20 | ffmpeg +1 | 4.1-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | ffmpeg +1 | 4.1-r0 | — |
| Alpine v3.18 | ffmpeg +1 | 4.1-r0 | — |
| Alpine v3.17 | ffmpeg +1 | 4.1-r0 | — |
| Alpine v3.16 | ffmpeg +1 | 4.1-r0 | — |
| Alpine v3.15 | ffmpeg | 4.1-r0 | — |
| Alpine v3.14 | ffmpeg | 4.1-r0 | — |
| Alpine v3.13 | ffmpeg | 4.1-r0 | — |
| Alpine v3.12 | ffmpeg | 4.1-r0 | — |
| Alpine v3.11 | ffmpeg | 4.1-r0 | — |
| Alpine v3.10 | ffmpeg | 4.1-r0 | — |
Advisories 3
- openSUSE-SU-2020:0024-1 Security update for ffmpeg-4 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10754-1 ffmpeg-4-4.4-5.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3609-1 Security update for ffmpeg SUSE / openSUSE Security Updates · Feb 4, 2026