CVE-2026-125249

Description

FFmpeg 7.1 through 9.0.2 contains an integer overflow in ff_vk_decode_add_slice() in libavcodec/vulkan_decode.c that miscalculates the Vulkan hwaccel bitstream buffer size. Attackers can supply a crafted stream with over 2 GiB of slice data per frame, causing memcpy() to write past a smaller pooled host-mapped buffer.

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25136
• https://github.com/FFmpeg/FFmpeg
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vulkan_decode.c#L345
• https://www.vulncheck.com/advisories/ffmpeg-7.1-through-9.0.2-heap-out-of-bounds-write-via-vulkan-slice-buffer-sizing