FFmpeg through 9.0.2 Memory Exhaustion DoS via APE Decoder apedec.c

Advisories

FFmpeg through 9.0.2 Memory Exhaustion DoS via APE Decoder apedec.c

Severity: medium
Date: 11/9/2026
Affecting: FFmpeg <= 9.0.2
CVE: CVE-2026-125104
CWE: CWE-789 Memory Allocation with Excessive Size Value
CVSS: 6.8
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25703
Patch Commit
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/apedec.c#L1601
https://github.com/FFmpeg/FFmpeg
Credit: Joshua Rogers (AISLE Research), Michael Niedermayer
Description: FFmpeg through 9.0.2 contains a memory exhaustion vulnerability in ape_decode_frame() in libavcodec/apedec.c that fails to enforce the 73728-sample limit for legacy APE frames. Attackers can supply a crafted legacy Monkey's Audio file declaring an enormous nblocks value to force gigabyte-scale allocations and cause denial of service.

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