Description
FFmpeg through 9.0.2 contains an integer overflow vulnerability in ff_prores_kostya_encode_init() that miscalculates frame_size_upper_bound using 32-bit arithmetic for large frame dimensions. Attackers can supply a high-resolution video transcoded with the prores_ks encoder, causing encode_frame() to write slices past an undersized packet buffer and corrupt heap memory.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| FFmpeg | FFmpeg | ≤ 9.0.2 | — |
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 | ffmpeg | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 24.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 22.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 20.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 18.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 16.04 LTS | ffmpeg | No fix yet | — |
Advisories 1
- WID-SEC-2026-4419 ffmpeg: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25573 issue-tracking
- Patch Commit patch
- https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/proresenc_kostya_common.c#L286 technical-description
- https://github.com/FFmpeg/FFmpeg product
- VulnCheck Advisory: FFmpeg through 9.0.2 Heap Buffer Overflow via ProRes prores_ks Encoder third-party-advisory