CVE-2026-125256FFmpeg through 9.0.2 Heap Buffer Overflow via RISC-V Vector diff_bytes Routine

Descripción

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in ff_llvidenc_diff_bytes_rvv() that allows attackers to corrupt heap memory by triggering negative length values in the Huffyuv encoder. Attackers can supply RGB video narrower than 8 or 16 pixels for huffyuv transcoding on RVV-enabled RISC-V builds, causing writes past the encoder's temp buffer.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25573 issue-tracking
• Patch Commit patch
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/riscv/llvidencdsp_rvv.S#L26 technical-description
• https://github.com/FFmpeg/FFmpeg product
• VulnCheck Advisory: FFmpeg through 9.0.2 Heap Buffer Overflow via RISC-V Vector diff_bytes Routine third-party-advisory