Description
block_cmp() in libavcodec/zmbvenc.c in FFmpeg 4.1.3 has a heap-based buffer over-read.
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 20.04 LTS | ffmpeg | 7:4.2.4-1ubuntu0.1 | USN-4431-1 |
| Ubuntu 18.04 LTS | ffmpeg | 7:3.4.8-0ubuntu0.2 | USN-4431-1 |
| Ubuntu 16.04 LTS | ffmpeg | 7:2.8.17-0ubuntu0.1 | USN-4431-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.11 | ffmpeg | 4.2.4-r0 | — |
Advisories 1
- USN-4431-1 ffmpeg vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
References
- https://trac.ffmpeg.org/ticket/7980
- GLSA-202003-65 vendor-advisory
- USN-4431-1 vendor-advisory
- GLSA-202007-58 vendor-advisory