Integer Overflow to Buffer Overflow Affecting mkvtoolnix package, versions <99.0-r1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.2% (9th percentile)

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  • Snyk IDSNYK-ALPINE324-MKVTOOLNIX-19866296
  • published16 Sept 2026
  • disclosed13 Sept 2026

Introduced: 13 Sep 2026

NewCVE-2026-90783  (opens in a new tab)
CWE-680  (opens in a new tab)

How to fix?

Upgrade Alpine:3.24 mkvtoolnix to version 99.0-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mkvtoolnix package and not the mkvtoolnix package as distributed by Alpine. See How to fix? for Alpine:3.24 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1