---
id: CVE-2026-125224
title: FFmpeg through 9.0.2 Vorbis Parser CPU Exhaustion via Invalid Extradata
summary: >-
  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 strea…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-400
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-09T20:58:59.946259Z'
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T21:06:55.096Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125224'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25694'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/90f5e61a1da2dcc0050169af8ca593530f26071b
    label: Patch Commit
  - url: >-
      https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vorbis_parser.c#L312
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-vorbis-parser-cpu-exhaustion-via-invalid-extradata
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 Vorbis Parser CPU Exhaustion via
      Invalid Extradata
tags:
  - cve.org
ingestedAt: '2026-11-09T19:18:02.595Z'
---

## Overview

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.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.