Description
The flv_write_packet function in libavformat/flvenc.c in FFmpeg through 2.8 does not check for an empty audio packet, leading to an assertion failure.
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | ffmpeg | 7:4.0.3-1 | — |
| Debian 13 | ffmpeg | 7:4.0.3-1 | — |
| Debian 12 | ffmpeg | 7:4.0.3-1 | — |
| Debian 9 | ffmpeg | 7:3.2.14-1~deb9u1 | DSA-4449-1 |
| Debian 8 | libav | 6:11.12-1~deb8u7 | DLA-1809-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | ffmpeg | 7:4.2.4-1ubuntu0.1 | USN-4431-1 |
| Ubuntu 18.04 LTS | ffmpeg | 7:3.4.6-0ubuntu0.18.04.1 | USN-4431-1, USN-3967-1 |
| Ubuntu 16.04 LTS | ffmpeg | 7:2.8.17-0ubuntu0.1 | USN-4431-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | ffmpeg | 3.4.2-4.12.4 | SUSE-SU-2018:3609-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 | ffmpeg-4 | 4.0.2-bp150.21.1 | openSUSE-SU-2019:1066-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ffmpeg-4 | 4.4-5.2 | openSUSE-SU-2024:10754-1 |
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 12 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 | — |
| Alpine v3.9 | ffmpeg | 4.0.4-r0 | — |
| Alpine v3.8 | ffmpeg | 3.4.6-r0 | — |
Advisories 7
- USN-4431-1 ffmpeg vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-3967-1 FFmpeg vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4449-1 ffmpeg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1809-1 libav - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10754-1 ffmpeg-4-4.4-5.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1066-1 Security update for ffmpeg-4 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3609-1 Security update for ffmpeg SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/FFmpeg/FFmpeg/commit/6b67d7f05918f7a1ee8fc6ff21355d7e8736aa10
- USN-3967-1 vendor-advisory
- 20190523 [SECURITY] [DSA 4449-1] ffmpeg security update mailing-list
- DSA-4449 vendor-advisory
- [debian-lts-announce] 20190529 [SECURITY] [DLA 1809-1] libav security update mailing-list
- USN-4431-1 vendor-advisory
- https://github.com/FFmpeg/FFmpeg/commit/d8ecb335fe4852bbc172c7b79e66944d158b4d92