CVE-2026-125248 PUBLISHED

FFmpeg 9.0 through 9.0.2 contains an integer overflow vulnerability in libavcodec/ffv1enc_vulkan.c that undersizes the float remap GPU buffer for large frames. Attackers can supply large GBRPF32 or GBRAPF32 images or videos that, when transcoded to FFV1 with the Vulkan encoder, trigger out-of-bounds GPU memory writes causing crashes or memory corruption.

• Joshua Rogers (AISLE Research) finder
• Michael Niedermayer remediation developer

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25136
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/ffv1enc_vulkan.c#L330
• https://github.com/FFmpeg/FFmpeg
• VulnCheck Advisory: FFmpeg 9.0 through 9.0.2 Integer Overflow via FFV1 Vulkan Encoder Remap Buffer

• Integer Overflow or Wraparound CWE