Detections
Analytics

Fedora 44 : libebml / libmatroska / mkvtoolnix (2026-b56cbfe203)

high Nessus Plugin ID 367896

Synopsis

The remote Fedora host is missing one or more security updates.

Description

The remote Fedora 44 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2026-b56cbfe203 advisory.

 Latest mkvtoolnix stable update (changes: https://mkvtoolnix.download/doc/NEWS.md), with the fix for CVE-2026-90783.
 Includes required updates of libebml and libmatroska.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected libebml, libmatroska and / or mkvtoolnix packages.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2026-b56cbfe203

Plugin Details

Severity: High

ID: 367896

File Name: fedora_2026-b56cbfe203.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/20/2026

Updated: 10/20/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.38

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-90783

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.5

Threat Score: 5.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:fedoraproject:fedora:44, p-cpe:/a:fedoraproject:fedora:libebml, p-cpe:/a:fedoraproject:fedora:libmatroska, p-cpe:/a:fedoraproject:fedora:mkvtoolnix

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 10/11/2026

Vulnerability Publication Date: 9/13/2026

Reference Information

CVE: CVE-2026-90783