CVE-2015-8789

Publication date 29 January 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Use-after-free vulnerability in the EbmlMaster::Read function in libEBML before 1.3.3 allows context-dependent attackers to have unspecified impact via a "deeply nested element with infinite size" followed by another element of an upper level in an EBML document.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libebml	16.04 LTS xenial	Not affected
	15.10 wily	Ignored end of life
	15.04 vivid	Ignored end of life
	14.04 LTS trusty	Fixed 1.3.0-2+deb8u1build0.14.04.1
	12.04 LTS precise	Fixed 1.2.2-2+deb7u1build0.12.04.1

Notes

sbeattie

mkvtoolnix contains an embedded copy of libebml, but looks to use the system version

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.6 · Critical

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Changed
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	9.6 · Critical
Exploitability score	-
Impact score	-

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H