---
id: CVE-2020-26664
title: >-
  A vulnerability in EbmlTypeDispatcher::send in VideoLAN VLC media player
  3.0.11 allows attackers to trigger a heap-based buffer overflow via a crafted
  .mkv file.
summary: >-
  A vulnerability in EbmlTypeDispatcher::send in VideoLAN VLC media player
  3.0.11 allows attackers to trigger a heap-based buffer overflow via a crafted
  .mkv file.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
vendor: videolan
product: vlc_media_player
affected:
  - vlc_media_player < 3.0.12
  - debian_linux = 9.0
  - debian_linux = 10.0
patched:
  - vlc_media_player 3.0.12
published: '2021-01-08'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-26664'
references:
  - url: 'http://videolan.com'
    label: cve@mitre.org
  - url: >-
      https://gist.githubusercontent.com/henices/db11664dd45b9f322f8514d182aef5ea/raw/d56940c8bf211992bf4f3309a85bb2b69383e511/CVE-2020-26664.txt
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2022/06/msg00012.html'
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/202101-37'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2021/dsa-4834'
    label: cve@mitre.org
  - url: 'http://videolan.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://vlc.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://gist.githubusercontent.com/henices/db11664dd45b9f322f8514d182aef5ea/raw/d56940c8bf211992bf4f3309a85bb2b69383e511/CVE-2020-26664.txt
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2022/06/msg00012.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202101-37'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2021/dsa-4834'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01473
epssPercentile: 0.72663
ingestedAt: '2026-07-05T00:59:25.770Z'
---

## Overview

A vulnerability in EbmlTypeDispatcher::send in VideoLAN VLC media player 3.0.11 allows attackers to trigger a heap-based buffer overflow via a crafted .mkv file.

## Affected

- `vlc_media_player < 3.0.12`
- `debian_linux = 9.0`
- `debian_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `vlc_media_player 3.0.12`