CVE-2026-125266

Description

FFmpeg through 9.0.2 contains an uninitialized stack memory disclosure vulnerability in old_codec23() of libavcodec/sanm.c that leaks stack bytes into decoded frames. Attackers can supply a crafted LucasArts SMUSH/SANM animation using codec 23 with an inline table to expose decoder process stack memory in output video.

Affected Platforms

Weakness Type

CWE-908

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25718
• https://github.com/FFmpeg/FFmpeg
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/sanm.c#L799
• https://github.com/FFmpeg/FFmpeg/commit/d42cb1925987cc27899441ce39fa7bd2647dc72e
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-stack-me…