Description
MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library's ODML superindex parser due to integer wraparound in 32-bit arithmetic. Attackers can craft a malicious AVI file with oversized entry counts that cause an undersized heap allocation, allowing a heap buffer overflow when the file is parsed with mkvmerge.
Published: 2026-09-13
Score: 8.5 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6502-1 mkvtoolnix security update
History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sun, 13 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Moritz Bunkus
Moritz Bunkus mkvtoolnix
Vendors & Products Moritz Bunkus
Moritz Bunkus mkvtoolnix

Sun, 13 Sep 2026 12:45:00 +0000

Type Values Removed Values Added
Description MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library's ODML superindex parser due to integer wraparound in 32-bit arithmetic. Attackers can craft a malicious AVI file with oversized entry counts that cause an undersized heap allocation, allowing a heap buffer overflow when the file is parsed with mkvmerge.
Title MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound
Weaknesses CWE-680
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.5, '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'}


Subscriptions

Moritz Bunkus Mkvtoolnix
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-14T18:14:43.959Z

Reserved: 2026-09-13T12:01:36.028Z

Link: CVE-2026-90783

cve-icon Vulnrichment

Updated: 2026-09-14T17:32:47.881Z

cve-icon NVD

Status : Received

Published: 2026-09-13T13:16:29.560

Modified: 2026-09-14T19:18:10.193

Link: CVE-2026-90783

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T18:00:17Z

Weaknesses