FFmpeg through 9.0.2 Vorbis Parser CPU Exhaustion via Invalid Extradata

Advisories

FFmpeg through 9.0.2 Vorbis Parser CPU Exhaustion via Invalid Extradata

Severity: medium
Date: 11/9/2026
Affecting: FFmpeg <= 9.0.2
CVE: CVE-2026-125224
CWE: CWE-400 Uncontrolled Resource Consumption
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/25694
Patch Commit
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vorbis_parser.c#L312
https://github.com/FFmpeg/FFmpeg
Credit: Joshua Rogers (AISLE Research), Michael Niedermayer
Description: FFmpeg through 9.0.2 contains a denial of service vulnerability in libavcodec/vorbis_parser.c that re-parses invalid extradata for every packet when valid_extradata remains false. Attackers can supply crafted Ogg or Matroska Vorbis streams with large invalid extradata and many packets to exhaust CPU during demuxing or probing.

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