CVE-2026-125190

Description

FFmpeg through 9.0.2 contains an information disclosure vulnerability in decode_mvc2() in libavcodec/mvcdec.c that leaks uninitialized stack memory through unchecked palette indices. Attackers can supply a crafted MVC2 stream declaring few colors but referencing higher palette indices, copying process stack contents into decoded RGB frames.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25278 ↗
• https://github.com/FFmpeg/FFmpeg/commit/3a5eb948e76dc6390e4b3cff7becf84bc492b7af ↗
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/mvcdec.c#L141 ↗
• https://github.com/FFmpeg/FFmpeg ↗
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-stack-memory-disclosure-via-mvc2-decoder ↗