CVE-2026-125096

Description

FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in libavcodec/tiertexseqv.c that allows attackers to leak stack contents by triggering failed RLE unpacking. Attackers can supply a crafted Tiertex SEQ file so seq_decode_op1() copies an uninitialized 64-byte stack block into decoded frames, exposing stack memory in visible output.

Affected Platforms

Weakness Type

CWE-908

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25715
• https://github.com/FFmpeg/FFmpeg
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/tiertexseqv.c#L94
• https://github.com/FFmpeg/FFmpeg/commit/c896bbb24535685509a816af09665cb73bf2d0c7
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-memory-d…