CVE-2026-125224
Received Received - Intake

FFmpeg Denial of Service via Invalid Vorbis Extradata

Publication date: 2026-11-09

Last updated on: 2026-11-09

Assigner: VulnCheck

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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Meta Information

Published
2026-11-09
Last Modified
2026-11-09
Generated
2026-11-09
AI Q&A
2026-11-09
EPSS Evaluated
N/A
NVD
CVE-2026-125224
EUVD
EUVD-2026-120313

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
FFmpeg FFmpeg From 0 (inc) to 9.0.2 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

FFmpeg through version 9.0.2 has a denial of service vulnerability in the Vorbis parser. When valid_extradata is false, the library re-parses invalid extradata for every packet. Attackers can exploit this by sending crafted Ogg or Matroska Vorbis streams with large invalid extradata and many packets, causing excessive CPU usage during demuxing or probing.

Detection Guidance

Detecting this vulnerability requires monitoring for excessive CPU usage during media file processing. Check for processes using FFmpeg with high CPU load when handling Ogg or Matroska Vorbis streams. Use system monitoring tools like 'top', 'htop', or 'ps' to identify suspicious FFmpeg processes.

Impact Analysis

This vulnerability can lead to system slowdowns or crashes due to high CPU consumption. If exploited, it may disrupt media processing tasks, cause unresponsive applications, or require system reboots. Users processing untrusted media files are particularly at risk.

Mitigation Strategies

Immediately update FFmpeg to the latest version that patches this issue. If updating is not possible, restrict access to media processing functions or block suspicious Ogg/Matroska files with large invalid extradata. Monitor CPU usage for unusual spikes during media handling.

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