CVE-2026-107678

FFmpeg through 9.0.2 contains a stack exhaustion vulnerability in av_encryption_init_info_free() in libavutil/encryption_info.c, which recursively frees AVEncryptionInitInfo linked lists built by the MOV demuxer's mov_read_pssh(). Attackers can supply a crafted MP4 file with tens of thousands of small pssh boxes to exhaust the stack and crash the process, while also causing quadratic CPU consumption.

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24593Issue Tracking
• https://ffmpeg.org/Product
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/mov.c#L8070Product
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/encryption_info.c#L219-L231Product
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-stack-exhaustion-via-recursive-free-of-pssh-boxesThird Party Advisory