CVE-2026-125207 PUBLISHED

FFmpeg through 9.0.2 contains an uncontrolled memory allocation vulnerability in the Interplay ACM decoder that allows attackers to exhaust memory via an attacker-controlled block size. Attackers can supply a crafted ACM file with maximum level and row count in extradata, making decode_init() allocate nearly a gigabyte and deny service.

• Joshua Rogers (AISLE Research) finder
• Michael Niedermayer remediation developer

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25703
• Patch Commit
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/interplayacm.c#L101
• https://github.com/FFmpeg/FFmpeg
• VulnCheck Advisory: FFmpeg through 9.0.2 Excessive Memory Allocation via Interplay ACM Decoder

• Memory Allocation with Excessive Size Value CWE